I recently bought the Incredibles DVD. When played on my Sony DVD 665 and the sound is piped through either COAX or optical to my 1050, the digital sound detection on the 1050 drops out every 10 to 20 seconds. In other words, the sound goes away for 2-4 seconds every 10 to 20 seconds. It seems as if the 1050 is searching for the digital signal. Does anyone have any idea what could be causing this?

I have two different DVD's

I truely appreciate your help