Currently Being ModeratedApr 30, 2013 10:49 AM (in response to ourladyofsorrows)
You can try doing a Restore on the iPod in iTunes. The Restore button is on the iPod's Summary screen. This will erase the iPod, re-install its software, and set it to default settings. If there is a software or settings issue causing this problem, a Restore should fix it.
Otherwise, there may be a hardware problem with the iPod's headphones jack.