I usually get very good battery life, the phone was fully charged when I got to work. A few hours later I went to hook it up to my pc speakers to listen to music and it was off. It would not turn back on. During my ride home from work, almost an hour, I had it on the car charger and it would not come on nor did it seem to be charging. When I got home I plugged it to the wall charger and it sat for about 2 hours before it came on and began to charge. Any idea of what happen, is there something I need to do?