Is my battery shorting or something? Seems this happens about once every 2 months. I'll leave the phone on the charger all night so in the morning I take it to school on a full battery, and then after about 1-2 hours of having it on, it shuts off and then the battery is drained so much that it won't even turn back on. I have to take it home and charge it all over again. It doesn't happen often, but I was wondering if anyone else gets this?