I have an 80GB Zune but don't have the same problem you're describing. Go exchange it for a new one
I bought some Video Eyeware for mp3 players. So i went and tried it at the store on a 30g Zune and it work great so I Bought an 80g the only in stock . Brought it home and their was buzzing in the video out sound. Took it back got a 2nd pair same thing. Thought it might be glasses so I Tested it w/different earbuds and the zune still had buzzing so I figure there must be a malfunction in the Zune . Has anyone else had this problem. And what is Zune doing to fix it.