I bought this 80gb classic refurbed the day that the new ones came out and it's been great except for this strange problem. It doesn't affect playback or anything, but sometimes after being ejected properly and unplugged it will just restart...shows the apple screen and restarts. It wouldn't worry me except for the fact that the hard drive in it makes a scary clunking noise every time it happens. I don't really know what to do about it, because it only happens every once in a while (this morning it happened for the first time in a couple of weeks) and I probably couldn't recreate it if i took it into the apple store. Has anyone ever seen a problem like this?