Ive had every iPhone so far and have had my iPhone 4 since release day. Over time ive noticed the home button has gotten more and more messed up. Like it doesn't respond all the time. I have to click it like 4 times sometimes to turn on my screen. And when i double click for mutlitasking bar it goes to home, etc. I took it to genius bar a few weeks ago and the lady said it was working fine in front of her and the software test said whatsapp might be messing it up and its not hardware related because it only happens sometimes. She told me to restore phone from scratch and i did so but problem is still there. any ideas?