Odd lines of pixelation appear when a render finishes

Hi all!

As you can see in the images attached, I'm getting these weird lines if pixelation on my renders. They only show up when the render is completed for some reason. I've already tried a reboot and using different files for the render however I keep getting this issue. I have only included a section of the render to protect a sensitive file.

Any ideas on how I could fix this would be greatly appreciated!

SolidworksPhotoview 360