Since this hasn't gotten any replies I will try to rephrase the question:
Sometimes when I try to play some songs on my 1st gen nano, a problem appears.
It plays the song I selected for maybe 2 seconds (sometimes up to half a minute, but most of the time not that long) and then it just automatically skips to the next track. After two seconds or so, it again skips to the track after that, and so it goes on untill I turn it off.
Rebooting or updating the database doesn't seem to help - not all the time at least.
Has anybody got some suggestions on how to fix this?