Plex does not play movies anymore

I use Plex to manage and view all my movies, tv shows and music located at my personal home storage system. It consists of two programs:

  • the Plex Media Server running on my server
  • the Android app running on my Android TV box, connected to my tv in the living room.

This normally works really well. But one evening when my girlfriend and I wanted to watch a movie, it suddenly didn’t want to start.

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