my battery life was fine (great even) untill recently, but in the last 2 nights, I go to bed with over half full battery (last night it was over 70 percent) I turn the phone to silent for overnight, only have it on in case I wake and can't get to sleep and want to look at something for a while... Anyway, both mornings, when I wake up, the hone is completely drained. yesterday so completely that it did not even turn on till it was plugged in, and today, the low battery popup cam on. thig is, before this, I have been able to have it like this, even some nights listening to audio books in bed for hours (not last night or the night before though) it would be still at 50% or better... cause all its doing at night is standby. well, according to battery usage now(through the menu) it is still just standby and idle- using nearly 50% between them of the battery! whats going on here?