That sounds like a software problem to me to be honest but I suggest you take a look.
I did some tests. I actually noticed that the problem only occurs (probably) when I put TV in standy mode. When restarting from standby, the image quality is degraded. If, on the other hand, I exclude the quick start mode, the image looks correct.
surely on reboot from standy image and colors are bad.
I hypothesize a defect in my device otherwise others would have already reported.
The current sw release on my device is 256. I have already tried to reset to factory settings both the previous and the latest version R51M_Android_P_V256 but the result is the same