My MacBook Pro seems to loose WiFi connection after coming back from sleep. Here is what I tried:
1. Go into Network Preferences
2. Turn off Wi-Fi
3. Delete the Wi-Fi service
4. Delete the Automatic location
5. Using the + button to create Wi-Fi again, and then rejoin the network. Also, under the settings gear icon, choosing Set Service Order and moving Wi-Fi upwards.
If this does not work, I will post my next attempt or solution
WiFi seems to be working after the above fix, but the 10.7.1 update seems to have resolved the issue.
Curious how this worked out for you. I have a new iMac that seems to be suffering the same problem
Tracking the problem on here:
http://www.scotiasystems.com/blog/it-hints-and-tips/wifi-problems-after-upgrading-osx-to-lion/
Just had a post from a user who’s spoken to Apple with a suggested solution!