My EE has also started locking up, although it's maintained battery power nicely, after hibernating. At first I thought locking the screen before closing would prevent the problem, but it doesn't. Is there some way to turn off hibernation and just go back to old fashioned sleeping? The frustrating thing is that I have had zero problem with this on the PE, which has come out of hibernation each and every time with no problem and loses almost no battery power at all.