You could try restoring the factory defaults. If it can be accessed through itunes, you can click on the ipod and it will bring up the ipod on your screen. You can then find the menu that has a setting called restore factory defaults. If this doesn't work, then take it into a store like a best buy with geek squad and if u have a warranty on it then it wont cost much or at all. You could have a battery that wont hold a charge which means that it says its charged and then it loses it when you unplug it. Then they would replace the battery for like 50 bucks or so without a warranty. i had this happen with my ipod a few months ago.