It appears you are running on Mac? I migrated from PC to Mac a bit ago and have found the same issue on the Mac. The PC can flawlessly load up thousands of files, the Mac gets it knickers in a twist at about 1000 it seems. I have not found a fix as yet. I decided to take out the dlc folder quite a few and I left about 500, and now it works like a charm. What I'll do, in case some of them are corrupt, is to add just a few every time I'm gonna play and then see when it starts happening. I didn't update to Catalina yet, another reason to stick with Mojave for a little more time :) I'll try that too, sounds like a great idea. For the record, in reddit someone pointed out that save files could get corrupted and cause the crash, so he suggested to "clean" them. But I really don't know how to do that. Any clues? Maybe by piling up solutions, we Mac users can finally enjoy the game :)