Coplestone

Hello there, I have a very peculiar crash in the Old City. I'll be exploring the area absolutely fine until I come across Grub Burrows or any Grub enemies, even the big grub boss. The game CTDs or stops responding after a couple of seconds of fighting these little grubby SOBs. I have no idea what could be causing this? Has anyone else experienced Grub related crashes, or Old City crashes in general? Any tips would be great. Thanks.