Have you tried changing the physx configuration settings from auto to your dedicated gpu? It’s in the nvidia control panel. Sometimes windows will reset this idk why so always check it now and then.
Seems to work fine on my amd card. I believe (not 100%) it is an issue with the 536.40 Drivers?
https://www.nvidia.com/en-us/geforce/forums/game-ready-drivers/13/521773/geforce-grd-53640-feedback-thread-released-62923/