ive had my nano for about a year. and lately when i turn it on in the middle of a song it just fuzzes out white. then it shutts off. i put it on the charger and let it charge for a full day. the battery says its charged, so i began listening to it again. and after a few minutes it does the same thing, and when i plug it in too charge it says its dead. what the heck?i just charged it?! is my nano crashing? or does it have a battery inside that needs to be changed? do they even have batteries? arent there plug-in chargers for a reason?