Airport issue upon wake from sleep

When my mac pro wakes from sleep it connects to my preffered wireless network but it has some serious issues and doesn't work. When it restarts the airport icon shows connected, but mysteriously shows a weak signal and when I try to do anything that needs to talk to the network it fails. The only way to fix the issue is turn airport off then on again and hey presto I'm back on a full signal and can surf n stuff.
I'm using a 1st gen Airport Express N basestation, which works fine as I have 5 other macs in the house (non a mac pro) that don't have the issue.
Looking in my logs i see a few interesting things, it looks like when the system is woken up it sets the country code to X3 and then fails to get a proper link. When I restart airport it sees the network uses GB as the country.
I can't be the only person with this problem.
Feb 18 07:25:44 Big-Mac kernel[0]: en2: 802.11d country code set to 'X3'.
Feb 18 07:25:44 Big-Mac kernel[0]: en2: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64
Feb 18 07:25:44 Big-Mac kernel[0]: Intel8254x -- Link Down -- 00:1d:4f:48:99:d5 -- called by disable() --
Feb 18 07:25:43 Big-Mac configd[14]: rtmsg: error writing to routing socket
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0x0
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x0
Feb 18 07:25:44 Big-Mac kernel[0]: -- PHY Specific Status Register (17d) = 0x8000
Feb 18 07:25:44 Big-Mac kernel[0]: Intel8254x -- Link Down -- 00:1d:4f:48:99:d4 -- called by disable() --
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0x0
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x0
Feb 18 07:25:44 Big-Mac kernel[0]: -- PHY Specific Status Register (17d) = 0x8040
Feb 17 23:42:12 Big-Mac kernel[0]: System Sleep
Feb 18 07:25:44 Big-Mac kernel[0]: System Wake
Feb 18 07:25:44 Big-Mac kernel[0]: Previous Sleep Cause: 5
Feb 18 07:25:44 Big-Mac kernel[0]: USB caused wake event (EHCI)
Feb 18 07:25:44 Big-Mac kernel[0]: Intel8254x -- Link Down -- 00:1d:4f:48:99:d5 -- called by enableHardware() --
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0x0
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x4000
Feb 18 07:25:44 Big-Mac kernel[0]: -- PHY Specific Status Register (17d) = 0x8000
Feb 18 07:25:44 Big-Mac kernel[0]: Intel8254x -- Link Down -- 00:1d:4f:48:99:d4 -- called by enableHardware() --
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Advertisement Register (04d) = 0xde1
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Link Partner Ability Register (05d) = 0x0
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Advertisement Register (09d) = 0xe00
Feb 18 07:25:44 Big-Mac kernel[0]: -- Auto-Negotiation Gigabit Link Partner Ability Register (10d) = 0x4000
Feb 18 07:25:44 Big-Mac kernel[0]: -- PHY Specific Status Register (17d) = 0x8000
Feb 18 07:25:44 Big-Mac kernel[0]: WLCE_COUNTRY_CODECHANGED
Feb 18 07:25:44 Big-Mac /System/Library/CoreServices/backupd[25846]: Backup requested due to disk attach
Feb 18 07:25:44 Big-Mac kernel[0]: en2: 802.11d country code set to 'GB'.
Feb 18 07:25:44 Big-Mac kernel[0]: en2: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 7 8 9 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 40 48 56 64 104 112 120 128 136 36 44 52 60 100
Feb 18 07:25:44 Big-Mac kernel[0]: jnl: disk8s3: journal start/end pointers reset! (jnl 0xaddec18; s 0x1be000 e 0x1be000)
Feb 18 07:25:47 Big-Mac TextMate[17557]: Error checking for new version: no Internet connection
Feb 18 07:25:47 Big-Mac TextMate[17557]: Will try again in one hour
Feb 18 07:25:49 Big-Mac kernel[0]: AirPort: Link Up on en2

I had the same issues at 10.5.2, however, they went away when I upgraded the OS to 10.5.3. You can now get the 10.5.4 combo upgrade.
Joe

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Airport issue after wake from sleep (lion)

With 10.6, this was not a problem. With Lion, very often after wake up from sleep mode, the system is unable to reconnect to my airport extreme base station. Killing the prefs in the library did not help. Any suggestions?

My wife's Macbook has EXACTLY the same problem and I've been through dozens of suggestions trying to fix it and the problem still persists.
The problem started right after I upgraded to Snow Leopard but also installed an Airport Extreme router and WPA2 wireless encryption. I've deleted all the networks, changed the order to put the Airport as the highest preference, deleted all the keys on the keychain, ran DiskUtility, all to no avail.
I'm not sure if this is somehow related to the Airport Extreme or occurs with any router. Also, have another MacBook Pro (unibody), and it does't have this problem connecting to the same Airport Extreme.
The other factor is it is intermittent --- and doesn't always fail. Rebooting the Macbook or the router will get it to re-connect, as will shutting off and turning on the Airport several times. But that's not a solution to the problem.
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AirPort dead upon Wake from sleep

I am using a Mac Mini connected to a DSL modem to share its Internet connection over AirPort. I can initially connect to the AirPort network with my laptop, but after the Mini is put to sleep and wakes up its AirPort is no longer functional. The icon shows the grey airport bars with a black arrow indicating internet sharing, but it's not actually on. I choose "Turn off Airport" from the menu bar, but nothing happens. It continues to show that airport is on, but nothing is broadcasting (even my dumb wireless detection keyfob device shows no wireless signals in the vicinity). No amount of fiddling with the airport (through the menu bar, through internet connect, or System Prefs panel) will get it to turn off. Any ideas?
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After Lion upgrade, having network issues after wake from sleep

After upgrading to Lion from 10.6.8 on my MacBook Pro (15-inch, Early 2011), I am unable to connect to the Internet after the computer wakes from sleep. I should rephrase this - I am able to ping IP's and DNS (DNS servers are present) however none of my apps will connect (Safari, iChat, etc) -> they all indicate the Internet is unavailable. I have two Airport Express's running 7.5.2 extending a WiFi network off an Airport Extreme running 7.5.2. This issue is specific to waking from sleep. Any thoughts or suggestions would be appriciated.

It's definitely linked to Time Machine and backups.
I think If I put my machine to sleep/close the lid and Time Machine happens to be performing a backup, when I open the lid again, the network connection is lost and I receive a bunch of errors about the backup disk being unavailable.
This means that if my mbp isn't in the middle of a backup when I put it to sleep, wifi comes back up without a problem.

No Airport activity on wake from sleep (but only when opening the lid)

I've read a lot of discussions dealing with wi-fi issues, but none seems to match my own problem.
I purchased a MBP 13" 2.4 GHz mid 2010 a few weeks ago and I'm running SL 10.6.3. I connect to the internet via a Time Capsule ethernet connected to a D-Link DSL 300T modem. Everything is updated and running smooth, but on wake from sleep opening the lid there's no way to get Airport working. Most of the times it's inactive, but I can not activate it in System Prefs > Network. Sometimes shows up as active, the Airport icon in menu bar keeps blinking but can't connect to the Time Capsule (whose light stays green all the time). The only way to get it back to work is restarting the MBP. This does never happen if I don't close the lid, though putting my Mac to sleep: on waking Airport works fine.
I'm enclosing the Console log:
12/06/10 20.50.36 kernel System SafeSleep
12/06/10 23.12.03 kernel hibernatepage_listsetall start
12/06/10 23.12.03 kernel hibernatepage_listsetall time: 241 ms
12/06/10 23.12.03 kernel pages 567484, wire 98732, act 121807, inact 433, spec 197, zf 47, throt 0, could discard act 62083 inact 54861 purgeable 15277 spec 214047
12/06/10 23.12.03 kernel hibernatepage_listsetall found pageCount 221216
12/06/10 23.12.03 kernel IOHibernatePollerOpen, mlget_interruptsenabled 0
12/06/10 23.12.03 kernel IOHibernatePollerOpen(0)
12/06/10 23.12.03 kernel writing 219736 pages
12/06/10 23.12.03 kernel image1Size 257469952
12/06/10 23.12.03 kernel PMStats: Hibernate write took 7803 ms
12/06/10 23.12.03 kernel all time: 7803 ms, comp time: 1432 ms, deco time: 0 ms,
12/06/10 23.12.03 kernel image 511232512, uncompressed 900304896 (219801), compressed 508019200 (56%), sum1 29e36aa5, sum2 c7031b67
12/06/10 23.12.03 kernel hibernatewriteimage done(0)
12/06/10 23.12.03 kernel sleep
12/06/10 23.12.03 kernel Wake reason = EC LID0
12/06/10 23.12.03 kernel System Wake
12/06/10 23.12.03 kernel Previous Sleep Cause: 5
12/06/10 23.12.03 kernel AirPort: Link Down on en1. Reason 4 (Disassociated due to inactivity).
12/06/10 23.12.03 kernel en1: 802.11d country code set to 'X3'.
12/06/10 23.12.03 kernel en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140
12/06/10 23.12.04 configd[13] network configuration changed.
12/06/10 23.12.05 kernel no card!
12/06/10 23.12.05 kernel no card!
12/06/10 23.12.05 kernel no card!
12/06/10 23.12.05 kernel no card!
12/06/10 23.12.05 kernel no card!
and so on until I restart.
I hope this may get fixed with a software/firmware update, but I'm wondering whether it's a forecast of future hardware failures.
Thanks in advance.

Hi,
my MBP 13" Mid 2010 running 10.6.4. has similar problems. I like to use it closed lid connected to an external display with apple usb keyboard. In closed lid mode airport connection fails several times or I do get a poor connection, e.g. one or two curves in the airport menu bar icon with significant lower connection speeds. I do connect to a airport extreme n station with does its job rock solid. as my wife uses a two year old macbook and I have got an G4 with a sonnet airport card running both without problems even from a greater distance in our home it seems to me that the macbook pro has serious problems operating with the internal wifi antenna in closed lid mode, maybe due to shielding from the lid?
Has anybody experienced the same problem or successfully found a way to solve this problem? When using open lid mode wifi problems never occurred, but that's not the preferred option for my desktop table.

Launch application upon wake from sleep

Is there an automator that will launch an application when the computer wakes from sleep? I do video chats w/ my elderly mother via iChat. I can wake her computer from my home using WakeOnLan. However, she sometimes quits iChat so it is not always running. I would like to have some sort of automator set to launch iChat everytime the computer wakes from sleep. I assume if iChat is already running, it would not matter.
If anyone knows how to do this or if it is even possible, please let me know.
Thanks,
Randy

Gary,
Thanks for pointing me in the right direction. I ended up using DisplayWatcher as it also has the ability to run an automator application upon waking from sleep. There were some other apps that were too complicated for me -- had to enter Unix commands/code and I did not understand how to do this.
Thanks again,
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Black screen upon wake from sleep when I change power state while in sleep

Hi,
I'm having this problem where my MacbookPro won't always wake from sleep.
OSX is 10.6.3 and fully updated.
I've done a lot of troubleshooting, and I can now replicate the issue 100%:
1 - Put the MacbookPro to sleep by closing lid
2 - Change power source (from plugged-in to battery or vice versa)
3 - open lid - MacbookPro will wake, but stays at black screen and is unresponsive.
Only if I change power state while sleeping will this issue show. Anyone else experincing this issue, and anygot got a clue on what to do?
regards,
Lasse

I've seen the same issue after upgrading to 10.6.3. I have a one year old MacBook Pro. I would have the screen be black after coming back from sleep or hibernate (tried both).
The workaround I found is to close the lid -almost- all the way and then immediately open it back up again, like I am catching the Mac going back to sleep and then changing my mind. For whatever reason, this has been reliably solving my issue for the last couple weeks reliably.
Only other oddity I noticed is that immediately after upgrading OS X told me that my one year old battery needed to go in for servicing...
Anyway, now all looks right with the world assuming you don't mind a quick close/open cycle.. Lovely...
Tim

Time Machine "preparing backup" eternally upon wake from sleep

at a bit of a loss here...
iMac 24" (version which offered 7300GT as BTO option)
10.5.5 with all updates applied
LaCie 500 gig USB 2.0 drive directly attached.
Up until about two months ago, Time machine functioned fined. Then for some reason, the following started to happen. (no known reason, no software update related etc, that I know of)
scenario... Time Machine functions correctly EXCEPT when waking from sleep. If iMac wakes from sleep and attempts a backup immediately (e.g. more than one hour has passed), it gets stuck "preparing backup" forever. I've let it run overnight (actually as long as about 30 hours), it never stops. Finder and other programs become extremely non-responsive, machine is almost unusable. Literally, the only way out is to manually shut down external drive, with attendant warnings/errors.
What I've done:
1) deleted the time machine .plist file
2) erased, repartioned (as a single partition) external drive
3) started brand new time machine backup (takes about three hours)
At this point, time machine will backup up fine... I can force a successful backup, if I leave the machine running, at one hour it does a successful backup.
BUT, as soon as it goes to sleep, time machine is hosed.
The only workable method for using time machine is to turn the external drive and time machine off when not using it, and turn the whole shootin' match on to do what essentially becomes manual backups. These backup are fairly lengthy, as time machine also does lengthy "preparing backup", but they complete in about 30 minutes to one hour.
Given that time machine doesn't give mountable/cloneable backup, I'm probably going to go back to Carbon Copy Cloner. Still, I like the ease/regularity of Time Machine, and would use it if it works.
Any ideas?
thanks

It could be a number of things. There are lots of things that Time Machine does in order to "manage" backups -- apart from just copying data to the backup drive.
It has to manage the transition of hourly backups into daily backups and must also transition daily backups into weekly backups. Each time it does this it has to move a lot of data around. It also has to maintain indexes of everything so you can quickly find backups should you want to perform a restore.
I've also noticed that there are circumstances that can cause TM to question whether it can trust it's existing backup database... I've caught Time Machine saying that it needs to do a "deep traversal" of the backup (basically it wants to check and see what it really has) and this can take a very long time.
Still... 30 hours is an extremely long amount of time. I'm almost wondering if there's a problem with either your USB bus or your drive when they wake up such that you may be getting a huge number of retries on something that should have happened quickly.
I'd suggest you start the "Console" utility, select "All Messages" at the left, and then watch the messages being written to your log file. Not only does Time Machine log all of it's progress messages to the system.log (in more detail than you'd see in the Time Machine UI), but so do lots of other system processes. If you're getting USB bus problems the error messages would likely show up in the same log. I'm especially suspicious about non-TM related causes since you said you've already blown away your TM backups & preferences and started from scratch and you're still getting the problem.
Try re-creating your problem with the Console log messages being displayed and see if you can't see something in the log that would let you get a little closer to the root cause.
Regards,
Tim

Screen blinks/flashes upon wake from sleep. is this normal?

I just got my Macbook a few days ago and started to notice that my screen flashes or blinks when it wakes from sleep. I have searched on Google and haven't seen any one post about it so I'm guessing this is normal. This is not the flicker of brightness that other people are talking about.
What happens is: I press a key or open the lid to wake it from sleep, and then very briefly for a second I will see the screen flash on (sometimes you can see a small image of the desktop), then it is black for a second, then the screen comes on normally. The delay of the screen coming back on after the blink seems to be getting longer so I was starting to worry this might be a problem. (granted the delay of the screen coming on is maybe like 2 seconds, but its noticeable) I had a Thinkpad previously and never noticed the screen acting like this.
If anyone can tell me if I need to bring this in to the nearest store or if it is normal I would appreciate it. I don't want to overreact as this is my first Mac and I don't have any problems so far. But I want to be safe if this is an indicator of future screen problems. Thanks!!
Macbook Mac OS X (10.4.8)

Take it to your local Apple store and they will send it off for repair. Or call Apple and they will send you a box to mail it in for repair.
I took my MacBook to the Apple store for the infamous screen flicker problem and they had the logic board and the LCD replaced. Problem is gone and the screen is better than before!
J

Alert beep upon wake from sleep

Hello,
I seem to have a strange alert beep that occurs when waking from sleep.
It only just appeared after I applied the 10.4.8 software update.
I wouldn't be concerned but today when I booted-up my machine immediately kernal paniced and told me to restart.
It seems independent of what software is open.
I can't seem to find any start-up items that could be to blame.
Any thoughts on trouble shooting this?
Thanks in advance,
Andrew

I just repeated the beep on wake from sleep.
Here is the console system log from before and after the sleep session.
Oct 15 11:44:05 r-r-andrew-nelsons-computer kernel[0]: hibernate image path: /var/vm/sleepimage
Oct 15 11:44:05 r-r-andrew-nelsons-computer kernel[0]: sizeof(IOHibernateImageHeader) == 512
Oct 15 11:44:05 r-r-andrew-nelsons-computer kernel[0]: Opened file /var/vm/sleepimage, size 1073741824, partition base 0xc805000, maxio 400000
Oct 15 11:44:05 r-r-andrew-nelsons-computer kernel[0]: hibernate image major 14, minor 2, blocksize 512, pollers 3
Oct 15 11:44:05 r-r-andrew-nelsons-computer kernel[0]: hibernateallocpages flags 00000000, gobbling 0 pages
Oct 15 11:44:08 r-r-andrew-nelsons-computer launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[75]: exited abnormally: Hangup
Oct 15 11:44:08 r-r-andrew-nelsons-computer configd[34]: posting notification com.apple.system.config.network_change
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: System SafeSleep
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: hibernatepage_listsetall start
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: hibernatepage_listsetall time: 68 ms
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: pages 105739, wire 23101, act 14824, inact 19629, zf 9273, could discard act 19923 inact 18989
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: hibernatepage_listsetall found pageCount 105739
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: IOHibernatePollerOpen, mlget_interruptsenabled 0
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: IOHibernatePollerOpen(0)
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: writing 105519 pages
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: image1Size 37189120
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: all time: 3605 ms, comp time: 675 ms, deco time: 0 ms,
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: image 114174464, uncompressed 272822272 (66607), compressed 113735084 (41%), sum1 4c777e1e, sum2 e53985f3
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: hibernatewriteimage done(0)
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: sleep
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: Started CPU 01
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
Oct 15 12:15:13 r-r-andrew-nelsons-computer kernel[0]: System Wake
Oct 15 12:15:15 r-r-andrew-nelsons-computer lookupd[242]: lookupd (version 369.6) starting - Sun Oct 15 12:15:15 2006
Oct 15 12:15:18 r-r-andrew-nelsons-computer launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[242]: exited abnormally: Hangup
Oct 15 12:15:18 r-r-andrew-nelsons-computer configd[34]: posting notification com.apple.system.config.network_change
Oct 15 12:15:18 r-r-andrew-nelsons-computer lookupd[249]: lookupd (version 369.6) starting - Sun Oct 15 12:15:18 2006
Any insight would be appreciated.
Cheers
MacBook Pro 15" 1.83GHz, 1G RAM, 80G HD (W8611), XP Home under Parallels Mac OS X (10.4.8) Dell Inspiron 4100 XP Home

Creaking sound upon wake from Sleep

I have only had my MBP (very first mac) last 1/25 and for a few days would wake from sleep totally silent. In the last couple of days occasionally it wil make a creaking sound for a couple of seconds after I raise the lid sounds kinda like gears. Not very loud tho. But since this is a refurbished (june 2012) unit I was just wondering if this is normal. My old toshiba would always make creaky gear sounding noises at wake from sleep for much longer. But since it is silent it is silent most times I was wondering if this was normal or a known problem?

Originally Posted by Lawrence-NYP
I suppose you have tried playing around with the sound settings in the control panel?
If that's the case, however no one else replies to your thread, you might consider re-format your computer.
In fact I have. And this is on a freshly formatted drive unfortunately.

Airport Issue After Waking From Sleep (White Unibody MacBook)

Hi all. On my new white unibody MacBook I have an Airport issue that always occurs after I wake the MacBook from sleep. I'm wondering if any of you have a similar issue and/or might not how to solve it.
Basically, when I wake the MacBook from sleep, it connects to my wireless network (and to whichever network I happen to be using at the time). A few seconds later, it will drop the connection, an exclamation mark will appear on top of the Airport icon on the menu bar, and when I click on the icon I see "Alert: No Internet Connection."
Then, if I just sit and wait, eventually Airport will connect to the network. But I have to wait -- selecting the network from the available list or turning Airport off and on doesn't help. And sometimes waiting isn't enough -- I sometimes have to go to "Create Network ..." and start all over to get a connection.
I've upgraded to 10.6.2 and the issue persists. I'd appreciate any help.
Message was edited by: Duke Spirit

My wife's Macbook has EXACTLY the same problem and I've been through dozens of suggestions trying to fix it and the problem still persists.
The problem started right after I upgraded to Snow Leopard but also installed an Airport Extreme router and WPA2 wireless encryption. I've deleted all the networks, changed the order to put the Airport as the highest preference, deleted all the keys on the keychain, ran DiskUtility, all to no avail.
I'm not sure if this is somehow related to the Airport Extreme or occurs with any router. Also, have another MacBook Pro (unibody), and it does't have this problem connecting to the same Airport Extreme.
The other factor is it is intermittent --- and doesn't always fail. Rebooting the Macbook or the router will get it to re-connect, as will shutting off and turning on the Airport several times. But that's not a solution to the problem.
Apple needs to pay attention to this as many people are now reporting the problem.

Mac Mini reboots restarts upon wake from sleep

Since 'upgrading' from Lion to Mountain Lion, my Mac Mini reboots (Restarts) whenever I wake it from sleep. I've applied every update hoping it will be fixed. Apple has been unable to resolve the issue short of their standard suggestion to reformat and reinstall from scratch. I've had to resort to disabling the energy saver.
A Google search turns up many similar complaints. Anyone have a fix or suggestion?
Thanks

Did you get anywhere with this? I have the same problem i fear as per my separate post
https://discussions.apple.com/thread/4779128

MacBook Air freezing upon wake from sleep

Hello there! Ever since installing Mavericks, my MacBook Air freezes nearly every time I wake it from sleep. Whever I open the lid, it allows me to enter my password, and then it freezes. Other times, it will let me log in, and then whenever I try to use Safari or another application it freezes. It doesn't completely freeze, I get the beachball and everything. What is going on?

Hello there AustinJGibson,
It sounds like you are having performance issues with Mavericks.
It sounds like you are seeing some performance issues after having installed Mac OS X 10.9.
I want to recommend the troubleshooting information from this article named:
OS X Mavericks: If your Mac runs slowly
http://support.apple.com/kb/PH13895
If you find your Mac is running slowly, there are a number of potential causes that you can check.
An app you’re using may require more memory than your computer has. To see how much memory your computer has, choose Apple menu > About This Mac. See the documentation that came with the app to find out what it requires. To find out how to increase your computer’s memory, see the documentation that came with it.Find the manual for your Mac
Quit any application that isn’t compatible with your computer. For example, an application may require a different processor or graphics card. See the documentation that came with the application to find out what it requires.
To see what processor your computer has, choose Apple menu > About This Mac.
To see what graphics card your computer has, choose Apple menu > About This Mac, click More Info, and then click Displays.
Your computer’s startup disk may not have enough free disk space. To make disk space available, you can move files to another disk and then delete files you no longer need on the startup disk.Increase disk space
Quit any apps you’re not using.
If none of these suggestions work, you may need to repair your computer’s disk in Disk Utility.Repair a disk
Next I would perform a Safe Boot:
Mac OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/ht1564
Thank you for using Apple Support Communities.
Regards,
Sterling

Wireless connection lost upon wake from sleep

I recently joined the 21st century and purchased broadband internet for my home. I am connecting via wireless ethernet using an original Airport card and flying-saucer type base station. All I did was connect the base station to the cable modem with an ethernet cable, plug it in, and restart my eMac. The network showed up right away and I was connected. Unfortunately, after my Mac went to sleep and I woke it up, not only was there not a connection, but there was no sign of the network.
Airport status showed it was still on, but in the spot where the networks show there was nothing. Restarting corrected the problem, but I assume only until it sleeps again. I can change the settings to make it monitor-only sleep, but I would like a more permanent solution.
What might help to fix the problem, and was there something I needed to do besides just turn my machine off and on to set up this network?
Thanks.

If you pose this problem over in the Airport or Tiger networking forums, you'll find you've stumbled into a morass of conflicting reports. There have been a disturbing number of reports of Airport connections lost in Tiger after wake from system sleep, usually not reconnected until after a restart. Some people have some success checking the box to put the Airport icon in the menubar ans using that to turn Airport off, wait a few minutes, and turn it back on, yet others have reported that only works part of the time and others report it doesn't work at all. Some have reported improvement after downloading and running the full OS X Update Combo 10.4.10 (PPC) on top of an OS updated via Software Update. And the large majority of Airport users never report any problems at all using Tiger. It really sounds like there's no one cause and no one fix.
There is a workaround: don't let the Mac go into system sleep. Use the Energy Saver system preference to set system sleep to Never, uncheck the 'put hard drives to sleep when possible' box, and set the display-only sleep to say 20 minutes. If the eMac is in a bedroom and the sleepers are sensitive to fan noise or power LED lights, that will be a problem, but likely less aggravating than losing your broadband connection.

Airport issue upon wake from sleep

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