Trouble buffering only one show

Is the problem with just this one episode or all episodes of the show? If the problem is just this one episode then the file is probably corrupted or incompatible somehow.

Can you play the episode using Plex Web?

Please attach the Plex XML for the episode.

A FYI regarding naming & structure:

Plex can be very picky when it comes to TV shows. You’ll have better results with recognizing the show, downloading metadata, displaying seasons correctly, etc if you follow Plex’s suggested naming and structure.

See Media Preparation guidelines. Specifically Naming ‘Series’ & ‘Season’ Based TV Shows.

After renaming & reorganizing the files you should also perform the Plex Dance. This ensures Plex’s database has updated, correct information.

Instead of:
X:\.....\$TV Shows\Westworld\Westworld Season 2\[TorrentCouch.com].Westworld.S02E01.720p.WEB-DL.x264.mp4

Use:

/TV Shows
   /Westworld
      /Season 02
         Westworld - s02e01.mp4
         Westworld - s02e02 - Reunion.mp4