Recently I switch out my analong monster cables (red and whites) for digital optical cable going from my tv to the receiver. I had been getting PL (i think) which sounded good. I thought by switching to the optical out on my tv/receiver I would get better sound. Instead on some programming I am only getting the front left and right channels working. It was switching back and forth depending on the programming. I thought the digital optical would be the best bet. Is there something I am missing??? I have a Samsung 5271F running to a vsx92txh elite.