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

Slow playback/buffering. 200MBPS internet speed. Both Roku devices affected.

About a week ago, both of my Roku Express devices began exhibiting severe playback issues. My internet is not the problem, as I'm showing over 200 MB/s download at the moment, and all other phones/computers are working normally. The Roku devices have been working fine for over a year before this occurred. I've restarted and even done a hard reset. Any solutions to this issue?