Total War: ATTILA

Total War: ATTILA

Ancient Empires 2.0 - Part 1 of 2
Multiplayer co-op crash around turn 20
So a friend and I are playing a co-op Iceni and Averni campaign and as the title suggests we are getting a crash as we wait for the other factions turns to resolve.
Both only running part 1 & 2 of AE and no other mods.
Clean install (both installed to try to last big update) but we have both verified integrity to make sure.
Any resolutions at all? We were just getting into the swing of things.