I have a 1080 ti as well and the game ran fine until I took a break and there were a few patches. I have a clean install of windows, I've deleted some good ol' asus bloatware, installed latest drivers, uninstalled and re-installed. This problem has been on-going since December, do I need to play with a 760 to make this game run? I've followed the guides to fix "nvidia cards", I have used Special K and I still am unable to stop the gameplay from freezing every second and being locked to 40 fps. I could live with the 40 fps, if my game wasn't a slideshow.
This is the only game on my system I have issues with, if as one person above said they are unable to fix our issues then maybe it is time for them to be issuing refunds for these issues they refuse to resolve.