I've got a Sony DE675 receiver and a Sony S550 DVD player. When watching movies, the sound will periodically cut out for a split second (from all speakers). I've checked all my connections, and tried both a digital coax and optical between the receiver and DVD player. Nothing has helped. I'm a novice at all this, so my question is, does this sound more likely to be a problem with the receiver or the DVD player? Thanks for any advice anyone has. This is driving me crazy.