hope you can help..ive synchd 160 songs on my daughters shuffle(3rd gen) from i tunes and after they played perfectly a few times when she tried it again 156 of then have vanished leaving the same 4 over and over...the shuffle hasnt been rebooted or plugged into the computer or itunes in the interim...anyway i started again from scratch..back to factory settings and then sync and the same thing happened this time almost mid playback...one minute playing all from the library the next only giving 5 this time to choose from...any ideas as its very frustrating