I’m sure game crashes happen often so this is partially vague, but I have only had this problem after the containment war event dropped. As far as I have seen, there is no real trigger. It just seems to happen. I will be doing anything, shooting, repairing an objective, running, and doing nothing. The game will freeze, and not respond to a close out. The only thing that lets the window close is a task manager override.
Apologies if this is already a discussion.