I recebtly just bought a RCA RT2380BK. Everything seems to work fine except when I am watching a movie in dobly digital (hooked up via coax cable) the sound at the begining is in synch with what is on screen. But as the movie continues the sounds starts to lag behind. I have the reciver set to coax and the DVD player which is a samsung set to coax. I set the reciver to do coax and teh DVD player the same. I have also tried a differnt DVD player with the same results. Any ideas what is going on? Both systems LCD indicate that the signal is dobly digital if that helps any.