I don’t have specific troubleshooting advice to give, but I have been using an Nvidia Shield Pro as my main streaming device for about 4 years now. It is overpriced for what it is, but it has been rock solid for streaming via both Jellyfin and Plex.
The official Jellyfin app is definitely not as polished as Plex, but it has consistently worked for me on the Shield.
That’s the Scrambler, Gary… gosh