I have been using my Toshiba SD-4700 now for about 4 months. I am generally pleased with it's performance with one exception. At least once, sometimes more, on just about every DVD, there is a very slight audio dropout. I thought it was the layer change but it happens at strange times, like 20 minutes into the movie. These drop outs are more annoying than anything else, and very subtle. Is this common for this machine or am I just spoiled?