There is an issue in the 2.00 software wherein the empeg will continue playing but the UI locks up for about 20 minutes. It is always the exact time lenght. We've been calling it "stuck jiffies" and Mark has fixed it in his HiJack. Many people like me never noticed anything becuause it happened when we had the player just doing it's thing and weren't selecting songs. So, maybe it was happening for 15 minutes before you noticed it was happening? If not, it is probably a seperate issue unless you've overclocked your chip!