The same problems here, act 1 games works smoothly, act 2 ocassionlal freezes , shoutdown to desktops. I have monster PC and only what changes in last couple days is new nvidia driver WHQl ( from 15.11.2017) that windows 10 creator update download it automaticly to my system. Others more demanding games (like VR sims) run fine.
Maybe we shuld roll back nvidia driver ? anyone tryed that ?