I don't know what this issue is, whether it is a hardware or software problem, but i figured i'd ask in case someone else knows before i take it back into the store. i'll be using an app (playing angrybirds for example) and the app will suddenly exit to the homescreen. first few times i thought i'd accidentally hit the home button, but it continues to happen even when i'm careful to avoid the buttons at the bottom. I'm on sprint with the epic 4g (which is the galaxy s2 right?) any suggestions would be much appreciated.