I have had my AVR300 for a few weeks now and love it. However, I have noticed something odd when watching movies that I never experienced on my old AVR. Occasionally, when watching movies in DD5.1, it will flip quickly to stereo pcm and then back to DD5.1 during a scene change... or probably, as it changes chapters. It has only done this on two movies with the most recent being Blade Trinity. What would cause a behavior like this... dirty DVD, AVR quirkiness, DVD player, the recording itself, etc?