I've had my Pantech Breakout for a couple months now, and I keep it on pretty low settings to keep the battery running for awhile (turn off data when I'm home, have the screen relatively dim), but for about a week now, my battery will go from around 80% to completely dead when the phone is locked. I charged my phone last night, used it a bit in the car today, and it was at 85% when I left the room. Came back about 10 minutes later, and the phone had died. Not just turned off, but the battery had drained to nothing. Is this a common problem, or is there a real issue with my battery?