I’ve had this issue since running LibreElec, I’ve got three boxes, and one of them is fine but the other two do it randomly.
Anything outside of watching PVR is fine but I’ve experienced it with both the TVH and MediaPortal plugin.
You can be watching TV and suddenly the image will get a red and green tint to it, if you change channel or skip back it will fix itself but usually it will come back again when it pleases.
It’s a little bit like the days of using the old fashioned 3d glasses that you used to put on to watch things in 3D, that’s the best way to explain it.
Any ideas? As I say, all other content is absolutely fine such as watching movies or TV shows.