XB1: frame rate drop and crashing

platform:.
Xbox 1

Description:
Playing multiplayer session and game crashes to desktop (sometimes in battle sometimes after a period of time about 30 minutes)
On going issue before new enemies were added.

Steps To Reproduce:
Frame rate issues around Boo church safe house. Crashing can be done usually in combat (at the player base defense is a good trigger)

Edit: can reproduce reliably in multiplayer (I play with the same person) single player seems unaffected.

Images / Videos:
N/A

Host or Client:
Host

Players in your game:
2

Specifications:
Standard Xbox 1.

Hope I can get a fix for this