When watching the DSS (RCA 5451)through the receiver using the optical input, there is an audible click through my speakers (all KEF Reference). When changing the channel it makes the click but if I do not let the receiver capture the optical input signal it doesnt pop. What would cause it to pop? I haven't tried the analog but I get the feeling it will work fine there. It has to do with the optical digital feed, I'm sure. I just bought the unit on close out because Sony is coming out with a new line and it was too good of a deal to pass up ($428). Is this a minor annoyance, can it be fixed or should I return it and buy something else?. Thanks for nay help.