Oh, I don’t like that at all

Three times in the last three or four days, my computer has shown the Airport (wifi) as being off, and nothing I could do would turn it back on again short of rebooting. At the advice of a friend, I tried rebooting it with command-option-p-r, but it’s happened again since, so that didn’t fix it.

I see a trip to the Apple Store in the near future.