DAI: My game keeps stalling and exiting randomly

* Set postprocessing in game to Low. (This is the easiest potential fix).

* Change your Nvidia Control Panel settings - Maximum pre-rendered frames ⚽; Power management (Performance); Vsync (adaptive or ON).

* As a last resort, try borderless windowed mode setting in game.

Other performance tweaks (may not be necessary):

* Defragment your hard drive (if it is not an SSD)

* Repair the game.

* Turn off Origin overlay in Origin.

* Play Origin offline (unless you plan on Multiplayer, then you won't be able to do this).

If all else fails, you can try a clean install of your Nvidia and DirectX drivers.

I used to have "device removed" error in Frostbite games as well, but with Mantle instead of DirectX, which a clean install fixed.

Okay, real quick, how do I repair the game? 

Go to My Games in Origin, right click on DAI and there should be a repair option in the list.