Android TV lots of artefacts

Hello,
it’s about month ago (maybe more) when this issue occurs. I started to have some artefacts in vide playback on my android TV. Sometimes more sometimes none but it is almost always in every video. When I play that video on other device there is no issue with picture. There is no issue even when I try to use another account on same TV. Is there somethin I can do about it? It is really annoying.

I have Android TV Sony Bravia KD-65XF8596 with latest android version (8.0) with latest PLEX app.

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