All of a sudden - as in, starting today - my Shuffle is not syncing about 90% of the time. It mounts fine in iTunes, but when I drag audio to it, sometimes it will copy as normal, but more likely I'll get a "Waiting for iPod" box followed by a sync error and the suggestion "Disconnect and reconnect, then try again". Is this indicative of a hardware problem with the Shuffle? I've tried several Restores, and they all seem to work fine. None have cured the problem though.