This error occurs (in this case) on all episodes in seasons 4 and 5 but not 1, 2 or 3. I have other TV series (the West Wing, CSI: Crime Scene Investigation) that have the same problem to a greater or less degree. I have other TV series where this doesn’t occur at all.
Are these mp4 or m4v containers? If they are, do this:
Go to
Settings - Server - Agents - Shows - TheTVDB
In there, grab the line ‘Local Media Assets’ with your mouse and drag it downwards, so it ends up being at the bottom of the stack of active agents.
Repeat the same under
Settings - Server - Agents - Shows - TheMovieDatabase
Settings - Server - Agents - Movies - Plex Movie
Settings - Server - Agents - Movies - TheMovieDatabase
Afterwards, ‘Refresh Metadata’ for the whole series.