MacBook Pro Airport is disabled on wakeup

Intermittently, my laptop would wake from snooze and the airport connection would mysteriously be disabled. I'd go up to the toolbar, right click and re-enable it and everything would be fine, but... it was annoying. I finally called Apple about it. They didn't have a root-cause, but they did suggest the following:

sudo rm /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
sudo rm  /Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist

Which seems to have worked. I didn't have a reliable repro, su I'm not sure this worked, but I haven't had the problem since.