my ipod nano has started to restart itself. It first happened when I just randomly started it. Then the ipod was fully charged and he was going on and off all the time, it goes off, shows the apple logo, than the first page and than again off. It went so on and the battery died. When I plug it in the computer, it's doing the same so I can't even restart him by pressing play/pause and center button at the same time. I really don't know what to do and garantie is no longer available. Please help me, I would be very grateful.