Okay, When the "end call" button gets pressed, it pops up a little phone menu and one of the selections is "airplane mode." It could be a case where it's being butt-dialed to turn on airplane mode. This happens even when access to the home screen is locked.
I guess That does not, however, explain why you cannot turn it off and must reboot the phone... or why it goes into a strange 'half-airplane' mode where you just have no signal
and don't know until you go to make a call and it tells you to turn it off airplane mode that you're in it.
Next idea..
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