This problem only appears in complex projects, such as a large number of tracks and a large number of plug-ins.
If I export multiple sounds with markers, it will take a long time for each sound to be exported successfully.
However, if you use real-time export, this problem does not occur.
In this situation, I always need up to a whole day to export my samples.
I had this problem when I used Cubase 10.5 in the early days. Now I use nuendo 11.3, the problem still occurs.
windows10 i7-10700 32GB RAM