Sky channel adverts buzzing sound through avr

[Bill12321]

I have my sky q box conected to my marantz avr and lately I think only through sky sports and movie channels especially when the adverts are on the sound turns into a distorted buzzing sound and you have to turn channel over and back to stop it. It's not a massive problem but leaving the channels on when not in the room Is a worry incase this is damaging my speakers as I don't know if this is a distortion or just an interference. 
Has this or is this happening to anyone else ?

[Kym+engineer]

Yes this happens to mine, I have the nr1710 and as you say normally on adverts, sometimes during programs but only ever live tv, not anything streamed. I have just tried turning off cinema eq and loudness control to see if that may be connected. Just a stab in the dark but cannot find any other settings that could be to do with it. It is like the type of signal changes during the adverts and the avr isn't noticing. I'm a sky engineer and it happens on any q box so it's definitely the avr. I'll update if the settings change cures it