Sorry! This is a common bug right now which we are trying to fix. Make sure your playlist and autoplay/repeat mode features are both enabled on your end.
As well, files are sorted through a mix of the title and file path. If you have all episodes of Seinfeld in the folder "Seinfeld" this should help. Furthermore, if you make sure the episodes are clearly named it also will organize it easier. For example, a title should look like: "Seinfeld.S1E3.mkv" and not "Seinfeld The Robbery s1e3.mkv". As well, if you manually go to next video using the arrow next to the play button, the loading should work just fine as a temporary workaround. 

Hope this works!