OS X doesn't reconnect to wi-fi after put to sleep.  Have to manually attach

After getting the latest OS X update, my IMac stop attaching to my wireless network automatically.  I have to step thrrough the diagnostic to get it reattached.  Any ideas?
Thanks!
Don

This is fairly common problem with at least iMacs and 10.7.3. There are several threads on this issue already.
There is no Apple approved fix yet. Apple will have to update the OS in some way to restore previous reliable connectivity.
In the mean time, there are several work arounds: 1) Don't let your computer sleep; 2) use the power button instead of the keyboard or mouse to wake up your computer; 3) replace a file in your system folder with a similar file from 10.7.2 to restore this function; 4) direclty connect with ethernet cable; 5) use an Airport Extreme or Express as a bridge.
Good luck!

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