Playback Issues - Audio/Video & Power

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 7

Black screen flashing

On set up, I had my streaming stick plus auto detect my TV, which it determined was a 4K 60Hz HDCP 2.2. When watching from any source, the screen constantly flashes black. When I manually set the Roku at 1080p, it does not flash, but I didn't buy a 4k TV to watch it in 1080… My wifi router is 5 feet from the stick, so signal strength is not a problem.
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