I read of this problem on Apple support forums. The problem is that I have a jailbroken 4.0.1 and I'm going to unlock it because I'm going to be in Europe for 4 and a half months starting on Tuesday. I don't want to go to the genius bar and get a phone with 4.0.2 and be screwed. Randomly in the past day, the phone has powered off twice. I hope by running the battery down all the way and charging it up all the way will fix the issue. What are your thoughts? If I plug it into a wall outlet, it will resume exactly where it was before as if the phone didn't even turn off but needed to be wakened from a deep, coma sleep.