I have a JVC dvd player 501-bk or something like that. It is a little older. I have it set up to output to my Marantz 5200 reciever via S-cable and optical for audio. Then reciever sends video to tv via S. I have noticed lately a couple of dvd's where the audio was looking like it was off from the video a little bit. It has come on DTS tracks, and if I stop the dvd player and start it again sometimes it appears to be better. Is this something wrong with the reciever or the dvd player or the actual dvd disc or the transfer?