so at least twice a day, sometimes 10s of times, my iphone's screen will just refuse to turn on. If I have my headphones in, I can't control the music via them either, and the only way to get the screen back on is through a hard reset. The only thing I've noticed consistanly is that it does it almost every time I open a document in air sharing, but it's not exclusive to this and does it randomly throughout the day whether or not I used air sharing. I've already tried to restore it and that didn't fix it. Any suggestions?