I have a 4G 20 gb color that is about 3 weeks old. For no apparent reason on Friday night my iPod would not play songs, but merely silently cycle through songs on the playlist. Once it started cycling the only thing I could do it hard reset. This would happy on every playlist whenever I selected a song to play. I don't sync often (maybe once a week for podcasts) but did use an AirPlay earlier that day. I did a factory restore and reloaded my content, which seems to have fixed the problem. Has anyone else experienced this?