I recently purchased the iPod Nano 5G on-line from Apple and since I got it, it stops mid-song. I then have to press the start-stop button to continue playing. There seems to be no pattern to it. I hate return it because it was customized with my name and I would have to mail it back and then wait for a new one. I have an updated version of iTunes and I've synched it more than once. Any ideas why this may be happening?