Last night when I went to bed at 10PM my iPhone 5 had at least 50% charge. I woke up at 2AM to find it completely dead and non responsive. I plugged it in and it started booting up, I went back to sleep. 2.5 hours later at 4:30AM I look at the phone and see that it only has 2% charge. It won't move from 2%. I tried rebooting it and unplugging it, no change. What's going on?!?! I don't want to have to buy a new iPhone right now when the 6S will be out so soon. I am worried that the phone will die within minutes after I unplug it. ETA: now after unplugging and rebooting it again it says it has 100% charge lol.