I just got a Samsung Flight last weekend and it worked well for a few days. Now it still works find during the day. It holds a charge and stays on and alarms go off when they're set to. But overnight for the past 3 nights, my battery has died (which means no alarms). I charge it in my car on the way home and it says it has 4/5 battery bars when I go to bed, but when I wake up (late) it won't turn on. What is going on here? This morning I put it back on my car charger and it instantly went to 3 bars, but it had refused to turn on before this.