Plutonium

It's an inconvenient issue but does not render the game unplayable.
I find that after every match of zombies, my settings keeps going back to:
Max FOV, LOD scale to extra, graphical quality goes back to extra. It's genuinely annoying having to set it back to my preferred settings over and over, it also causes some lag. Any help?

Recently been playing the WaW campaign and in the last mission, Downfall, My game keeps crashing. The mission plays for a bit in a black screen with Reznov having a monologue with the title drop, then it just crashes. This never occurred in any of the previous missions. Can anyone help?

Hello!, I've been wanting to play Bo1 for a while now and I've managed to download but no matter what I do, I can't full-screen it without these big annoying borders on the left and right side. Anyone know how to fix it?