I remember i've had a few audio sync issues before. Seemed to be a type of "handshake" issue, powered everything off, then on, and it was fine. Another time, my hdmi cord simply was acting up. Changed the cord and no longer had any problems. Ironically the last audio sync issue i had was playing a dvd in a laptop. I either had to change to windows media player, or had to launch it from a different source other than the autoplay. I can't remember exactly what i ended up doing to fix it.

All Things shall be revealed through the passage of time.