Is there a way to reduce crashes?

So I recently had a three week hiatus from the game because I got fed up with it constantly crashing during the end turn. With the new patch announcing a bunch of crashes had been fixed I turned the game on, played a few turns... And it crashes out of nowhere during a random siege battle.

I have a not-too-great PC with 16 gb of RAM. Do you think upgrading to something beefier might make a difference? Or are there any configuration changes that could be made to reduce the occurrence of crashes?

Thanks for your help!