My iPhone 4 just died and I don't have a clue why. I was listening to music on it in the car about 30 minutes ago. Brought it in the house with me, set it down on the counter and didn't touch it again until my husband called me on the house phone and asked me why I wasn't answering my cell. I picked up my iPhone and it was off. I tried turning it back on, plugging it in and nothing. It was fully charged, so I know it's not a dead battery. It is totally dead I don't know what to do. Anyone have any suggestions? I am thinking I am just going to have to send it in, but am kind of hoping someone here might have a suggestion on something I can do.