I would do this;
1- factory reset the camera using the reset button on the lite trap door, while connected, and leave at defaults (Auto) for 1 night while grabbing a screenshot and short clip
2- pending outcome of #1, adjust to basic recommended settings: 8192 CBR, 15 FPS, h.264, general/standard codec, make sure ROI is OFF, 1/60 manual exposure, IR Auto, leave all else at default 50. Take sample shot and video clip and post
It sure looks like macro blocking and/or ROI enabled.
3- If #2 still shows the blur and pixelization, run a temporary cable, just lay it in the ground, and repeat samples.
****If new cable still shows problem, I’d exchange the camera. After re-reading your last post, this actually should be step #1