I don't know if its my battery or what but my HTC AMAZE shuts off very often out of the blue, it occurs mostly when the battery is low around 10-20% but earlier it just died on its own when the battery level is still at 87%. I do restart my phone at least once a week. I also notice that sometimes when it shuts down by itself and I restart it again, the battery logo on the top right corner of the notification bar shows a gray battery with a exclamaton point over it instead of the usual green battery. I don't know if I should get a new battery or not or is it just the phone itself? I've had this phone since November and the one I'm currently using I received from t-mobile warrenty. So I'm guessing it was refurbished.