Alright, so steam launch options: -debug-flag. So I was just testing the debug mode and I don't know what it is that makes it happen, if it's the later levels, if it's just random, if it's time spent in debug mode or if it's something I do in it, but it makes the game crash occationally, seemingly for no reason. Just want to hear if there's something I should watch out for. This was with only the expansion packs added. Because if it's not something I'm doing, I can't imagine it would get better if I throw in some untested scripts into my game when trying my hand at modding. xD
I'm not aware of anything in particular bugging out with it, so if you figure out what's causing it please let us know.