MacBook Pro os 10.8.5 loses wifi connection when going to sleep

Hi all. I've a domestic wifi network with 3 Macs, 1 Xbox and 3 Android mobiles.
Only the two MBP with OS 10.8.5 have the same problem: when gone to sleep, they do not re-find the network after waking up. I've to make them search for it manually (they find it immediately, then).
Any suggestion?

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So, about a week ago my macbook pro started having lots of issues: wifi connectivity, slow performance, sound issues, spotlight wasn't working. After going through the issues with apple support, they decided the best course of action was to erase it...

So, about a week ago my macbook pro started having lots of issues: wifi connectivity, slow performance, sound issues, spotlight wasn't working. After going through the issues with apple support, they decided the best course of action was to erase the hard drive and do a reinstall. Since I have a recent backup this seemed like a good enough option. They were kind enough to send me a copy of the snow leopard disk to do the install since we couldn't get it to complete through the disk utility. Not sure why, since it says we are fully connected, it just never completed.
Anyway, so now that you have the background here is the new issue. The macbook pro keeps spitting out the disk I'm trying to install from. Disk utility and using the 'Startup Disk' function from the apple menu doesn't read the disk.
Can anyone suggest a solution to this vexing problem?
Thanks in advance.

Jeremy.Laurin,
have you tried agb76’s approach here?

My ipad 1 loses wifi connections when it goes to sllep. have to go into settings to reconnect. Does this all the time. please help.

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My imac loses wifi connection when it goes to sleep, how to correct?

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Are you running OS X Lion? If so there are unfortunately numerous threads on here discussing exactly the same problem. So far there doesn't seem to be a definitive solution, with everyone hoping that Apple will come up with a permanent fix.
Here's a quick search of these forums alone - depressing reading:
https://discussions.apple.com/community/desktop_computers/search.jspa?peopleEnab led=true&userID=&containerType=&container=&spotlight=true&q=Massive%20wifi%20pro blem%20with%20Lion
This 'fix' has worked for a few people but, unfortunately, not everyone:
http://osxdaily.com/2011/11/06/lion-wi-fi-problems-solution-mac/?utm_source=feed burner&utm_medium=feed&utm_campaign=Feed%3A+osxdaily+%28OS+X+Daily%29&utm_conten t=FaceBook

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Bought a new mid-2011 21.5 inch IMac this week. It is not re-establishing WiFi connection after waking from sleep. Was happening on OSX 10.7 that it came with, so updated to 10.8.2 and same problem exists.
I am running a mid 2012 MacBook Pro with Retina Display alongside, on OSX 10.8.2 and no problems at all. Cannot work out what is causing the IMac to fail and neither can Apple!
Could it be the Netgear Wireless Router 3 years old? Full signal strength!

Me too!
I am on a MAC Pro desktop and I am having the same issues. I go to system preferences and just click the network icon. Then I close mail and when it opens it now sees the network. This is getting very annnoying.

Just bought a macbook pro 2008, will not pick up wifi connection that my old lap top has very quickly. whats wrong?

I just bought a used macbook pro, turned it on and it will not pick up wifi connection n my house that my old lap top has done very fast and easy wifi connection. What do i have to do to log on to internet with wifi with my macbook pro?

That could be the reason they were selling the old macBook Pro. Does the network utility even see any WIFI networks? If it doesn't, and you know they exist, something with the WIFI might have failed. Can you connect using the wired ethernet port?
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My MacBook Pro OSX 10.6 has begun to lose Wi-Fi connection when idle. I can't re-connect unless I shut down computer and re-start. Worse, the system appears to lock up--I can't force quit, must press the power button to shut down. This problem occurs wherever I am using my laptop, not just with one particular Wi-Fi network.

I have been having the same issue for the last two weeks. No real indication as to why it ever began other than I had turned off my router and Airport Extreme Base Station off for a weekend while I was away from my place.
iPad, iPhone, iPod Touch, all have no issues at all with my Airport Extreme Base Station. Can stay connected throughout my living room, bathroom, bedroom, no issues whatsoever.
My 5 month old MacBook Pro 2.66 GHz Core i7 Airport is sometimes perfect, able to connect, DHCP, and browse without issue. Then, for no reason, I won't be able to join my wireless network, or when I can join, I can't pick up an IP address. And then it will connect, pick up and IP, and then it won't browse. No real rhyme or reason to when this will happen, or when it works.
I thought that it was an issue with my MacBook Pro, but then my sister visited with her brand new MacBook Pro 2.26 Intel Core 2 Duo, and while a month ago she was able to connect, DHCP, and browse without issue, this weekend she had all of the same issues I was having.
My XBOX 360 and MacBook Pro have absolutely no issues with the wired connection. Only my WAN seems to have this issue.
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I have a strong suspicion that I am getting wifi interference from my neighbors. Several new wifi signals have appeared in the last month coinciding with new neighbors moving in and some old ones getting wifi. Upstairs, I can pull up 6 or 7 networks, some broadcasting on the same channel. Downstairs, where my MacPro resides, I do not see those networks. My problem seems to manifest itself on my MacBook Pro when I move upstairs and can pick up the extra networks.
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MacBook Pro airport doesn't choose 5 GHz network when waking from sleep

Hi,
I recently set up a Time Capsule [TC] 802.11n (4th Gen) as my airport base station catering for my MacBook Pro [MBP], iPad (1st Gen), iPod (3rd Gen) and BlackBerry 9900. I have it set up in dual-band mode (2.4/5 GHz) with the same SSID, mainly hoping to take advantage of the increased speed of the 5GHz band during Time Machine backups - I get a Transmit Rate of 300 Mbit/s when connected at 5 GHz and 145 MBit/s at 2.4 GHz. Aside from that I don't really care which it chooses to be honest - my internet connection is only 12 Mbit/s. When I start up my MBP from a full shut down within an 'appropriate' distance from the TC, AirPort automatically selects the 5 GHz band and falls back to 2.4 GHz if I stray too far.
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I think it's a problem in Snow Leopard having read problems around the internet from users who have upgraded from Leopard to SL, most of whom seem to do what I'm thinking, i.e. setting up a different name for the 5 GHz network and putting it higher in the priority list that the 2.4 GHz one, however the solution isn't ideal/elegant and certainly not how it's supposed to work, but I've yet to find a definitive solution from Apple anywhere.
Anyone else having this problem? Anyone found a solution? Anyone heard anything from Apple?
Thanks!

Yes. I'm having a very similar problem. I don't have TC, but I have a netgear wndr4000. I'm always bring my MBP out of sleep and having to manually select the 5GHz band. Even when I know it should. I have different SSID's on each band, and I have tried setting the priority order, but that has another set of problems. When I get a little farther away, it will hook to the 5GHz band at 54Mb, but the 2.4GHz will be at 130Mb at the same distance. I thought it would make some type of smart choice about it.
I had been thinking about moving to a Airport Extreme because I've been told by others that their machines make the correct choice with the SSIDs set the same.
I too am on Snow Leopard, but I'll be upgrading soon.

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http://support.apple.com/kb/TS5357
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- David (your mileage may vary) PwrMc
:::::: if this doesn't work, then it was my evil twin who posted this!   ::::::::::
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Run down of computer: I have a Power Mac G4 tower, PANTHER OSX. I have wireless internet through our cable company—I use a wireless router. When I am connected to the internet, and browsing the web or something, if I let the computer go to sleep, it loses connection. I have to go back up to the little signal icon and reconnect to my wireless network.
I suspected it might be a setting through the router, but when my computer was comletely unplugged, and absent from the apartment, the other computer (G5 imac–TIGER) which was having the same problem, suddenly was staying connected even after going to sleep. When my computer came back home and was hooked back up, suddenly the other computer had the same problem again. So, I concluded that my G4 tower was the culprit, and perhaps not the router. We share a wirless network, so it's not surprising that this is the case.
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It's really annoying to have to reconnect each time I use my computer. And just to reiterate, I get internet through a cable modem using my airport card, so please answer the question with this in mind as settings are totally different from dial-up. I do not use PPP.
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Power Mac G4 Tower Mac OS X (10.3.4)

Tried that too! Notta.
This one's really a pickle! Even the Mac specialist at my office was baffled! He suggested shortening the name of my computer...(Jamie Cendroski's computer)...I didn't really understand how this had anything to do with it...but he's supposed to be the expert. He also suggested trashing my keychains and making new ones. I messed around with them, but I don't know enough about this stuff to be bold enough to trash them yet. I'll do a little more research before I do so. I think he might be onto something with the keychains though..?

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How do I fix my connection issues with my wifi. It disconnects numerous times daily. I turn off wifi and then back on to try to reconnect...it doesn't even find my network until I turn wifi off and on about 4 or 5 times and eventually my network will pop up and sometimes it doesn't so I am forced to reboot. I have 2 PCs, 3 ipads and 3 iphones on the network with no issues. I have also noticed the internet speeds on the mac are horribly slow. Any suggestions?

Please test after taking each of the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.
Step 1
Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Be sure to test on more than one Wi-Fi network, if at all possible. A desktop computer can be tested with a mobile hotspot, such as the hotspot created by a cell phone. If the problem only exists on one network, then the access point of that network should be the focus of your attention, not the computer.
Step 2
Disconnect all USB 3 devices. If you don't know which are USB 3, disconnect all USB devices except keyboard and mouse.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. If you find that Wi-Fi works better with Bluetooth disabled, you should use the 5 GHz Wi-Fi band. Your router may not support it; in that case, you need a new router.
Step 4
Open the Energy Saver pane in System Preferences and unlock the settings, if necessary. Select the Power Adapter tab, if there is one. Uncheck the box marked
Wake for Wi-Fi network access
if it's checked.
Step 5
Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.
Step 6
In the Wi-Fi settings, select
Advanced... ▹ TCP/IP ▹ Configure IPv6: Link-local only
Click OK and then Apply.
Step 7
Reset the System Management Controller.
Step 8
Reset the PRAM.
Step 9
Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first. Turn Wi-Fi off and then back on. You'll be prompted for the password when you reconnect. Save it in the keychain.
Step 10
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

MacBook Pro os 10.8.5 loses wifi connection when going to sleep

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