Have an 8G FUZE and when I unplug it from the computer after charging it or adding songs, it gives me battery low message and powers off - before refreshing media … then I power on and battery is at 100% and works fine. What could this be? Could be a defective battery or just a glitch… seems to happen consistently… unless I turn it off before unplugging it from the usb cable - then it is fine… strange… any insight is appriciated.