Constant pixelation with ceton 6ETH card.

stant pixelation w/ceton 6ETh card. I have directly hooked it up to ,y only cable feed into the house. The screen pixelates and is jittery while the picture is in motion. I have exhausted all avenues with Ceton. Can you Help? My ticket ID w/ceton is  QCC-508-51480. In case you want to review it. Thanks.