Harmony 15 cannot export full movie

Harmony 15, Windows 10. Brand new laptop used only for Toon Boom, good spec.

I made my first ‘movie’ in Toon Boom, when I export the movie (with all standaard settings) you can see at like 96 precent of the loading all the last frames go very quickly, then it will show an error message that Toon Boom does not work anymore and will shut down… and that’s what is does…

The movie is saved as a file on my computer, however the last part of the movie is not saved in the file.

What could cause this issue? And what is the solution?