Hi Danny,
It can be caused by an add-in. Try disabling some add-ins and run it again. Please see this article: Revit: Crashes after closing the program.
Please hit the "Accept as Solution" button if my post resolves your issue and give "Kudo" as appropriate.
Hello,
Try closing all the hidden views by using close hidden windows tool and after some time it won't crash .
If my answer solved your problem , Please Kudo and Accept as solution.
Thanks