Ok So i know this is going to be a weird one. I bought my wife a Sony BDP-S3700 as a little add on gift, it was intended to replace the aging DVD player on our secondary TV. It is connected via HDMI directly to our Samsung TV, and we use the TV speakers. The first unit i had displayed a very noticeable AV sync issue where the video was playing ahead of the audio. This could not be rectified with the AV Sync settings as they only went one way correcting audio that preceeded video. I returned that unit and got a new one assuming the original to be defective. The replacement had the same issue but not as bad, so i was really stumped. I then started swapping cables and inputs and eventually found the problem to be my HDMI cable (I had never suspected it as i was using a very nice cable from Blue Jeans and they have always been excellent.) So i swap the cable for a different BJC HDMI and all the problems were solved. Until an hour or two later when ti was back. So then i went out and bought brand new cables, i plugged in the new cable and it worked fine, for a few hours, then it was out of sync again. So finally i swapped the inputs on the TV, now both sources on both inputs seem to be working but I am not confident this will last. If it turns out that the problem is related to a single input on the TV (which only has two inputs, and we Have a cable box and BD player, does anyone have any suggestions? Is it possible i have missed a possible source of this sync issue?