Me and many others are encountering similar issues on Apple laptops since upgrading to OS X 10.8 (search for mountain lion wifi problems). Things that appear to

Me and many others are encountering similar issues on Apple laptops since upgrading to OS X 10.8 (search for mountain lion wifi problems). Things that appear to help for me are running a ping to the router in the background, or disabling WPA 2. Also, iOS 6/OS X 10.8 users are having trouble access points at my workplace, while other devices appear to be working fine. Since OS X 10.8, I'm also having trouble connecting it to my Samsung Galaxy S3's WiFi hotspot, whereas my girlfriend's 10.7 laptop is connecting without issue. That said, every OS upgrade seems to have a bunch of issues that affect a small number of users, and the current ones don't seem particularly abnormal.