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Plex is overhauling its apps with a redesign and under-the-hood upgrades
(www.engadget.com)
This is a most excellent place for technology news and articles.
Interesting, for all its faults I have found Plex to work very reliably for playback.
You can also try emby, it has its own different faults but I've found it better for my above issues than jellyfin. I remember finding something else with it which made me go back to Plex again, but it escapes me what it was.