I went to bed last night with the battery showing half charged. I went ahead and turned the phone completely off. (Held the power button down until the box came up and chose power off.) I did not plug it in to cahrge though. Next morning I turned the phone back on. It showed the white evo 4g screen and sprint screen. After it finished this I seen the batter was red then it said phone is turning off low battery and then shut itself off. How does this phone lose the rest of it's charged turned off? Anyonr else have this happen?