Every so often when I am watching a DVD, the dialogue will completely drop out of my center channel. I still get sound out of my other four speakers but nothing from the center channel. This problem didn't occur until about a month or two ago. Could my dvd player be the problem? If I turn off the dvd player and the receiver and then turn them back on the problem is usually fixed for a while. I am using the Liteon LVD-2001 with a Yamaha HTR-5560. The Liteon gives me a great picture via the 1080i upconvert but it has some problems such as loading and ejecting discs which makes me think that it might be the problem.