I have the Samsung nu6900 using optical audio into an older yamaha home theater receiver. The sound would cut out for 1/2 second intermittently. As per a recommendation on another site I installed a Easycel Audio Digital to Analog Converter DAC ($14.99) in between my tv and the receiver. The optical out of the TV goes into the DAC and the output is a left and right channel RCA which goes into the receiver. Set the TV to PCM, (NOT Bitstream). I no longer have audio cut outs AND the audio from the receiver is better. My conclusion is that older DAC in aging receivers cannot process fast enough compared to the new DAC I used. Good luck!