Imac loses wifi repeatedly

I opened the box on the new iMac, and updated software, uploaded some programs (skype, dropbox, firefox). Everything seemed to be working fine.
Then i added firefox sync.
is it a coinicidence that now i have connection problems?
skype connects and drops, connects and drops
efforts to load web pages are successful and then fail.
the ipad also semed to be failing, suggesting a problem with my router.
wired browsing was working fine.
Came home, and added firefox sync to home mac.
Now i cant use firefox without powerbook dropping internet.
However, here i am on safari without a problem.
I dont understand what is going on?
is it Firefox sync? is it something else?

The below has solved my Safari hanging when loading web pages and eliminated my finding the wifi on boot up. It has been a month now and waiting a minute always works for connecting to my airport extreme on boot. I was cleaning behind my desk and realized that the ethernet cable was still attached to the back of the iMac even though I had moved the airport upstairs. I disconnected it. I also opened network preferences. The wifi was moved a long time ago to the top for priority, but the inactive ethernet and firewire were still listed. I removed both the ethernet and firewire so the only connection listed is wifi. My computer has now reliabily found the internet for the last 3 weeks without waiting. It appears that having the other two options disrupts the connection process on boot. It also must cause the computer to continue trying to use the connection when using Safari.

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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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iMac spontaneously loses wifi in the middle of work, many times a day. Had been fine for a year and now much trouble. iPhone and iPad on same network do not have this trouble.
If I turn off iMac wifi and then turn it back on, network reattaches
Any help? Thanks....

The below has solved my Safari hanging when loading web pages and eliminated my finding the wifi on boot up. It has been a month now and waiting a minute always works for connecting to my airport extreme on boot. I was cleaning behind my desk and realized that the ethernet cable was still attached to the back of the iMac even though I had moved the airport upstairs. I disconnected it. I also opened network preferences. The wifi was moved a long time ago to the top for priority, but the inactive ethernet and firewire were still listed. I removed both the ethernet and firewire so the only connection listed is wifi. My computer has now reliabily found the internet for the last 3 weeks without waiting. It appears that having the other two options disrupts the connection process on boot. It also must cause the computer to continue trying to use the connection when using Safari.

IMac loses WiFi connection after waking from sleep on OSX 10.8.2

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.
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Could it be the Netgear Wireless Router 3 years old? Full signal strength!

Me too!
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Softwre Update would bring you up to 10.7.4 and there have been updates involving WiFi. Also here are some links to potential fixes:
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https://discussions.apple.com/docs/DOC-3421
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http://support.apple.com/kb/DL1501
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To switch to the 5GHz band, launch AirPort Utility, select your base station, and switch to Manual Setup. Click on the AirPort button and select the Wireless tab. Select 802.11n Only (5 GHz) from the Radio Mode pop-up menu. Click on the Wireless Options button and select Use Wide Channels. Click on Update to restart the base station.
Currently, no Mac-compatible adapters enable you to use the 5GHz band in older Macs or with older versions of OS X.
These Firmware updates may or may not apply to your system, but may help with your particular problem.
http://support.apple.com/kb/index?page=search&src=support_site.home.search&local e=en_US&q=keyboard%20firmware%20update

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I have a MacBook that is about 4 years old and a brand new iMac both are running the most up to date version of Lion. My old MacBook has no issues; however, my iMac loses its WiFi connection every time it goes to sleep. There are some discussions about this already out there but does anyone have a proven fix. This is very frustrating.

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I am have trouble with 2 new 21.5" iMacs losing wifi connection from my network. I have 4 other vintage iMacs that never lose connection. Please help.

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So basically just like my title states, when my computer wakes up from sleep about 70% of the time the internet will not work. My mac does see and connect to my network, but something isn't being sent as I have no connection when trying to surf the web. I then reset my modem and router, and it still doesn't work. What fixes my problem is a reboot or Logging out and back in. I don't know why that does the trick but it does. I have looked at http://support.apple.com/kb/DL1501, however this update is only for 10.7.3. Is there something I can do to fix this problem?
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Hello, this has worked for some...
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
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System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
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208.67.222.222
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Imac loses wifi repeatedly

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