If I have 4 people on my camp screen it Flashes and stuff , If I reduce it to 3 people it doesnt something is definately wrong. Also like others getting the Freeze randomly which has never ever happened until 11.1. Any reason this is happening especially the camp screen never did that until 11.1.
Try a few things. If Nvidia, rollback to the last driver, not sure which version, I think a January version. Also disable max background fps, or dropping down to DirectX 11, see if it improves.