Occasional Screen Flicker

Greetings. Ever since installing tvOS 16.5 on some app, and when playing some movies from my library, I'm seen the TV screen flicker.

My Apple TV 4K (3rd gen.) running tvOS 16.5 is connected to a Samsung UN50TU7000FXZA. I am using the FILMMAKER "scene" with INPUT SIGNAL PLUS set to ON. The Apple TV is set to 4K SDR with Match Frame Rate and Match Dynamic Range both set to ON.

Last night I was watching Bridge on the River Kwai (from my library) and in some scenes the TV screen was flickering. This movie is presented in the original theatrical aspect ratio so in the black bars I could see the flickering. Also, I have noticed the flickering when watching the Law & Order shows in the Peacock app. In this app the flickering appears during scene changes, when the screen is black and nothing else is displayed.

This has been happening since I installed the tvOS 16.5 update. Does anyone have any suggestions on where to start trouble shooting? I'm reluctant to start changing settings all willy-nilly.