Change your router channel number. Most times this works & is all you have to do.
See KB Articles: http://support.apple.com/kb/HT1401 AirPort troubleshooting guide
http://support.apple.com/kb/HT2712 Using network locations in Mac OS X
Click the Assist Me button.
In the next window that pops up, click the Diagnostic button & do the necessary.
Also if you are using one of Apple's routers, run the Airport Utility app which is located inside the Utilities folder.
If using Apple's Airport, please re-post over in one of the AirPort Forums.MacBook Pro, Mac OS X (10.6.7), Original MBP (2/2008)
Currently Being ModeratedJun 12, 2011 3:08 PM (in response to Baby Boomer (USofA))
Thanks. I wish it was that easy. Search the forums; there is another one with about 570 comments and responses. So are people just complaining, but it also seems like there is a genuine issue. I'm a creative pro experiencing wifi issues and I've been on the phone and had a genius bar appointment - resolving the issue with a clean re-install but I'm back to the a dropped wifi signal.
I'm really hoping this is fixed. in 10.7 or a separate fix comes out.