Add me to the list for the airplane mode. Got my phone on Tuesday, Dec. 1st, it happened the first time on Thursday. I powered the phone off and back on and it was fine afterwards. I thought it was something that I might have done, but then it happened again this afternoon. Came here to see if anyone else might have the same problem and I found this thread. So now it has me wondering if maybe it's more to it than something I may or may not have done at the time. This afternoon when it happened, I was trying to end a call, that would NOT end and when it finally did, I was in aiplane mode.