Plex not loading any of my files on Samsung TV

Hi there,
I’ve always used the Plex app through my Samsung TV, but recently i cannot seem to get anything to play.
It loads my library fine, shows all my TV shows and movies.
When I click on a program to watch, it begins to load with the specific show’s wallpaper, then I get the circular dots rotating round and round, and it never ends. It just keeps loading and loading and loading.
I’ve been able to use the Plex app through my PS4, however I’d prefer to keep using my TV directly.
Any ideas? Please help!