Nvidia + 2 monitor setup

I have 2 monitors and I used nvidia’s DSR for many years.

Since the last update I started to have big problems with FPS drops in WT.
Game sometimes begins to act like it’s gonna CTD. Freezes, low fps without a reason, blurred textures on some objects, visual bugs.

Turned off 2nd monitor in windows today and everything worked very good in game. FPS was high and stable.

It happens only in WT for me.

Alt+Tab also crashes videodriver in game often. But with 1 active monitor it works okay.