I need help!...I've had my andriod for about 2 months now and there has been three times now that i have picked up my phone a few hours after i last used it and the battery is almost totally dead. It was full when i set it down 2-3 hours earlier. Also, if i turn it off and back on, or plug it into the charger just for a second, the battery life goes back to where it was. Why does it do this? It it something bad?