I am updated to 4.0.2, not JB. For some reason, when I am listening to music and the song changes, the screen turns on after about 5 seconds. It's weird, there are no push notifications from my Messages, Facebook, Skype, AOl, or voicemail apps. It does this with all notifications turned off and the phone in Airplane Mode. Is this a feature? If so, how do you get rid of it? If it is a defect, should I exchange it? I initially thought that it was a software problem, but i think it might be a bad Home button or a sleep button. Any ideas?