Alright so. Further testing shows that...
On wireless, even a good wireless, the Vizios wireless card doesn't handle data well enough for a large 4k HDR movie for plex. But it does ok on netflix streaming. I can watch the highest quality content with dolbyvision and it works perfect.
On wired connection, I can get plex movies to work if the movie file is no more than, say, 60 gig.
*shrug*
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