All of a sudden for no discernible reason my 20Gb touch whell has started crashing. Was working fine on Tues, didn't use it yesterday, this morning, pick any track from a playlist and it would start to play and crash within a second.
I've just reset to factory settings and s/w 1.5 and it will now play for longer before crashing. has crashed 3 times somewhere into second track when played by playlists.
Playing via Artists and selecting artist and track does the same.
Ideas?

Since my first post, I've now erased the iPod disk (with disk utility) and restored s/w and is currently running into its 7th track ok.