Try clearing out save files so you only have around 10 or if you need others only keep the important ones. I make sure to go through and clear them up every now and then haven't had any save file issues. I also noticed the bigger the base the more it lags around the base and the longer the load in takes. It's kinda like ark survival if you think about it the larger the base the more the game tries to load in all at once which could cause the crashing.