As Jetson said (and I tried this today and it seems to have solved the issue (which I have lived with for two years!). Go into your settings on the TV and find Anynet (which if 'on' turn 'off'). It solved the problem. The only issue seems to be that I need to manually turn the volume off on the TV because Anynet used to turn the TV volume off automatically when I used my AV receiver. That said, it's lovely to watch TV without the constant breaks in the sound - I am going to report this to Samsung....