I've got an iPhone 4 that seems to have a recurring Home button problem. Sometimes I have to press the Home button 4-5 times to get back to the Home screen. I've done some research and found several posts saying to rebuild the iPhone from scratch or there was one that had you go through a series of key presses to recalibrate the Home button. Nothing seems to help and I'm wondering if maybe I have some kind of hardware problem. Has anyone else had a similar problem and if so, were you able to get any help at the Apple Genius bar. The iPhone is over 2 years old and I don't have Apple Care. Thanks.