it might be going south, but at 6 months old that would be a bit too soon.

Is it still under warranty? If so, take it back.

What about the batteries, are they charged? Some batteries do begin to fail early. Have you tried new batteries?

Have a look at Apple's support site for the Ipod and Ipod Mini here;
http://www.apple.com/support/ipod/

There may be some information there that helps you.

Good luck.

Mark