Can't seem to find this anywhere on the forums. My 3G would randomly (about twice a day) refuse to wake from sleep. Pressing the home button or the lock button just had no effect. When the problem originally occurred, I could plug the phone into its charger and that seemed to give it the jolt it needed to finally display. But after about a week of that, even plugging it in didn't work. I took it back to the Apple store and just got a brand new one and it's giving me the same problem. What could this be? Thanks.