Mine crashes often enough that I've abandoned using it and gone back to Word. I ended up wasting too much time restarting it and redoing things, when I have a research proposal deadline approaching.
For me, it frequently hangs and requires a force quite or outright crashes when copy/cut and pasting, using the undo feature, or importing references from Papers3.
New user here and I am having this same problem, It is very frustrating. Particularly when editing and reorganizing large sections.
However, you can still click in the outline and drag paragraphs to other sections and that at least preserves citations. The copy/cut and paste needs to be fixed tho.