More iPod problems...keeps asking me to set up ipod with name, etc?

So I've been using two libraries lately (one for vids and another for music), and I generally manually sync the videos so I can keep the music on there at the same time. Lately, though, when I reboot my iPod through a connection to the MAC, I get the initial set-up screen and "thanks for registering". This has happened at least two or three times in the past week, not counting the time I restored.

Anyone else had this same problem? How'd you fix it?

Thanks for any info.