Hey Xoipoep, Have you checked the charging port on your iPod? Lint or other foreign debris can get packed in there and stop the cable from locking into the port and making a solid electrical connection. With a strong light and magnifying glass look in and around the port, your looking for cracks, missing pieces or damage to the gold pins and debris, most often packed lint or corrosion. Attempt to blow debris out if that fails to work use a non-conductive probe, I find a round wooden toothpick works very well. Be careful not to touch, bent or damage the the gold pins on the long side and remove any debris on the bottom and sides. Also look and the locking springs, the silver bumps on the ends of the port, they need to be free to move and should give some push back. if corrosion is found try plugging / unplugging several times to remove it. If damage is found, contact your Apple store or the Apple Genius Bar, set up an appointment to have your iPod evaluated. Good luck. Cheers.