Sony DVP-S530D DVD Player
Experienced lip-synch issues, but Have other fix.
I began experiencing the lip-synch issues as well after watching just a couple of DVD's.  Stopping it and restarting has helped, but then I adjusted the audio setup on the player(I run it solely through my surround  sound reciever).  Since then I've watched at least a half-dozen movies and  have yet to experience the problem again.  If it recurs , I will be sure to  send it back.  Now that the sound problem has gone away, this component is  the crown-jewel of my home theater!  I am quite pleased with the sound and  picture quality... and absoultely in love with the format.