I'm not sure, but I think it's the wire. When I connect my iPod, the problem is, one side of the connector doesn't work, the other just barely. When I plug in, it requires to be jiggled a bit so it can start charging. If I touch the wire connector, if I pull it, it stops charging. I tried with my PC, my Mac and my external charger. It always make that charging sound when you connect, I hear it like 3 times in a row, and I'm sure it affects the battery a lot. I still have warranty. Can somebody help me?