Well I was having a lot of issues after the August Update, here is the thread I have made about it
https://www.halowaypoint.com/en-us/forums/f0258e8001734968984e8b56990f8daf/topics/game/f6531a5a-e7ae-4387-b5a1-e2a6ac68cad6/posts?page=1#post2
It seems like, after disabling sli, the issues got fixed immediately. Does that mean the sli support in the new update is broken?