this was episodically a problem with my Linn Genki in longer playing sessions. The end culprit was wear on the transport surface that gripped the top of the CD... the CD slipped when the player was warm. The fix was to build up the grip surface with thin frictionable tape which required opening up the player and the drive. A more cumbersome approach is the stick on CD rings but that's probably a good diagnostic approach if a CD has intermittent problems. If you try the stick on ring and the problems disappear the answer is found before taking the risk of working on the player.
