Not sure how to explain this but here goes. Some tracks, not always the same tracks, and not always in the same place in the track, the music replays briefly may be several times, the playing bar goes back with it and the time remaining and time played does the same. I have the extra buffer ticked and the cpu and ram are running at 10 to 15 %. OS is windows 8. Played sounded by the internal sounded card and usb port and hdmi cable and it is all the same. any one have any ideas ? thanks Tim.