I've tried 2 different batteries, and there is no rhyme or reason..ie no specific % that it happens at. It happens even when it's plugged in. I did a factory reset and it still behaves the same. It's absolutely insane that a replacement unit is doing the exact same thing my first one did, within 6 months. I read on XDA for solutions as many are having this issue. Some have said the wake lock app worked for them - setting it to partial wake. This so far has seemed to do the trick, but now my music player keeps starting up every so often. LOL. This is a nightmare. I'm calling square trade right now. Am so done with this mess