I just tried to shut off my iPhone 4S, but it didn't shut down. I pressed the power button until it displayed "Slide to Power Off" on the screen. I slid my finger across to power off, it went to the dark screen with the spinning wheel like normal, but it lingered there for longer than usual, and the wheel just kept spinning. I came back a few minutes later, and the screen was dark, as though off, but I pressed the home button, and the phone was awake. It was at a 2% state of charge when this happened, so I was surprised to see it revert to being on with such a low charge. Weird... Any ideas on why this might happen? BTW - Phone is not jailbroken, nor was it connected to anything. Thanks!