This article is spoiler free!
If you’re like me, when the Game of Thrones episode “The Longest Night” started this past Sunday you wondered, “What is wrong with my TV?”
Instead of smooth gradations from the darkness of night over the fields outside Winterfell to the torchlight on the troubled faces of the army awaiting the fate of humanity, the sky was full of blocky artifacts. Banding surrounded the bright lights in the darkness. I had a new TV in for review and thought, “there’s no way this is all because of the display.”
Source: IGN.com How to Fix Game of Thrones's Darkness