TV shows disappear from the library

I sometimes experience that TV shows that are initially in the library and work as expected, suddenly just disappear.

When they disappear from the library, they cannot be added to collections either, so this destroys the possibility of using this function.

Most recently, this happened with the TV series “Lysglimt i mørke”. It worked yesterday but is gone today.

What could cause this?

When I look up the TV show in my favorite folder it shows and works as a TV show.

That series looks like it was only added yesterday to TMDB so you may have do an Edit Metadata on one of the episodes in your library to get Infuse to repopulate it. New shows may take a day or so to populate completely to all of their servers. There may be a naming or file structure error that is keeping it from populating correctly in the library also.