Since I got my device a few months ago I've noticed that it makes some crackling noises while it is charging. It is technically in "sleep" mode, and the sounds seems to be coming out of the speakers. Everything is working fine, the device is fine except that it makes this poping/cracking noise every half hour or few hours - Doesn't seem to be consistent on how often it makes it. I've tried closing the game/program before putting it to sleep and even unplugging it and it still makes the noise.
