Plex 4K OriginalFiles dont playable after pausing or stopping

Server Version#: 1.21.3.4021
Player Version#: newest

Hello all,

my Plex server is running on Unraid Docker with a 10gb network card. The player is a Nvidia Shield TV Pro with 1gb Lan. On my Unraid server are my 4K original rips from my movies on regular Western Digital Red HDDs.
When I played a 4K movie it worked fine. But when the movie is stopped or paused, and then you play it again, I only have sound. The picture does not move and is frozen. The same happens when fast forwarding.
Does anyone have any idea what I can do?

Regards

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