Hi Kevin,
you have my sympathies! After a brief period of more activitiy a few weeks ago the forum now seems to be almost deserted, especially by devs.
I am sure you have tried everything imaginable, but just to be sure:
Have you tried (severe) simplifying / exporting only a small part of the model / exporting with no colour / selecting different output formats / playing with preserve model parts?
Does this occur with the newest version 300 9?
Best, Götz