I have only seen 1 maybe 2 recently. I would say it was lag switching because they have a perfect connection and is doing fine but when he gets into a firefight one on one his connection reds and his character gets very jumpy, glitchy. When this happens I do 0 damage to him and he shoots me like nothing is happening and kills me. After I'm dead his connection goes back to green after a few seconds and his character is just fine like nothing happened. You can claim this is just a some kind of connectivity issue and I was just unlucky but when it happens more than just once I don't think it's a real connection issue.