Help with Samsung Tv, optical cable and pc via HDMI sound pffft noise problem!

I had a Sony TV and had my PC Hooked Up via HDMI and optical out of the TV into my Denon. It never used to cause a noise when starting a game for instance.

Now that I have swapped to a Samsung TV and it's all plugged in the same I now get a pffft noise when the Games start some don't do it and some do. I'm guessing something is changing like Hz or something. Anyone know how I can stop this from happening?