Airport shuts off and won't turn back on

I have a MacBook Air and a Time Capsule base station that have worked beautifully since I bought them last summer. Over the past couple of weeks, however, Airport has started shutting down within minutes of my starting to use the wireless connection (via Safari or iTunes) and refuses to turn back on.
The base station itself seems fine, with a glowing green light. The only way I can start Airport again is to restart the computer. Airport is always on after restart, finds my network quickly, and then shuts off again as soon as I begin to use it.
I've tried the usual maintenance: Used Onyx to repair permissions, etc. Dragged the Airport pref file to the trash. Removed unnecessary Login items. Nothing helped.
The problem seemed to start around the time of the Airport Utility software update, the Safari beta (which I uninstalled) and the latest version of iTunes. Could the Airport update be the problem? Should I revert to the prior software? If so, what's the best way to do this?
Many thanks.

Thanks for the suggestions.
I do have Time Machine, but didn't need it to restore the earlier software for both the MBA and base station.Unfortunately, that didn't help. And Apple Hardware Test found nothing wrong.
Other things I tried (with the help of Apple support):
-resetting PRAM and SMC
-setting up a new wireless location in network preferences
I'll bring it to a Genius tomorrow and see if they can figure it out. The next step might be a reinstall.

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