My battery has been draining about 5% an hour while asleep with no apps running. I read online that restarting the ipad should fix it, and I did that, but the problem was still there.I decided to drain the battery completely and then recharge it to 100%. I did that, and now the battery is stuck at 100%. Ive been using it for 3 hours and its still at 100%. What can I do to fix this?