Stopping during sync

I just got three refurb e250 players from woot for my boys.  The first two I had no problems with.  I am synching the same songs on all three for now.  The third one will sync up to 7 songs without a problem but will then freeze during one song’s sync, and then say “stopped” on all the rest of the songs I am trying to sync.  If I try to move another song to the sync list in WMP 11, I get the following pop up error:  Windows Media Player encountered a problem while synchronizing the file to the device. For additional assistance, click Web Help.

I have to disconnect the player, plug it back in, and then I can get some more songs but it will always do the same thing.  It’s taking forever to load up the songs I want to.

Any ideas?  I have upgraded the firmware.