I'm sorry if this has already been talked about, but I could not find it. Most people are talking about when their phone is on, but what about when the phone is off and the battery seems to die? I've had a strange problem these last few days. I charge my battery for a while, and before I go to sleep, I turn off my phone, then I turn it back on when I wake up, which is anytime between 6:50am or 11:30am and it seems to have lowered to about 30% battery. Is this a normal problem? Can others test this on their phone? Or do I need a replacement?