The games have been pretty consistent and good the past 24 hours (I have played a lot in that time)
However some people are behaving ..... wrong.
I will say hi to someone with a gun. They would suddenly freeze on the spot looking at me. I move around and at a distance still looking at him and then get 1 shot shotgun from nowhere. while this guy is still standing still facing where I was.
Not proof of lag switching but having experienced it in many games there is strong evidence for this theory.
Suggestion for further releases are to monitor connections and if connections often drop rapidly and shoot up a lot, warn and disconnect. Something like 'Warning Internet unstable - disconnect possible.