When my 3G 15 gig iPod is left asleep and disconnected from a Mac, quite often it apparently crashes. Pressing the play button results in a cold start/reboot. At that point, the battery indicator generally shows that the charge is down somewhat, even if it was fully charged when it was last put to sleep. Usually the iPod has to be left disconnected and unused for a day or more for this to happen, but then it occurs pretty consistently. A few hours in sleep state doesn't seem to be a problem. Has anyone else encountered this issue? Does it have a fix?