In my last game I can not get past turn 134. It happens (a lot) in other runs, but usually more on late game, around turn 400. I've noticed that after turn 390 the game get stuck if I ransack outposts or cities. If I avoid ransacks the game goes on regularly. But with this game I don't know how to go on. 

Any tips? Any idea why the game get stuck so often? is it just me? 

Feedbacks are welcome, thank you guys