I have a Rotel RTC-965 and it is having problems with surround. I bought it used and when I got it, I was able to watch one movie in 5.1 surround. Now it will only play in pro logic. Has anyone else experienced anything similar, or have any input? I have changed absolutely nothing from the first movie that played properly. After the movie I turned everything off, then the next day I tried to watch another movie and could only get pro logic.