Hello Blythe,
sounds not nice. Usually such crashes are due to an inconsistent mod list and can be solved by a simple restart of Banished after changing mods for a new game. But these crashes actually happen when saving or auto saving. In your case it seems something different.
Anyway I would try to go to mod list from main menu, disable all other mods, exit and restart Banished and then start a new map in the North. Let me know if you still have problems.