No the auto wakeup has never stopped for me. It doesn't matter what time I go to bed I wake up at 5am.
The scary part is the last few months it bumped up to 4:15...sleep who needs it. I just lay there and doze till 5 ain't getting up that early. :wtf:
I try not to do that cause if i wake up at 4-4:15 which is annoying.. i know that if i fall back asleep for that 45 mins that will honestly be a hour, i wake up feeling horrible and more tired than if i had gotten up...