Plutonium

recently i bought a graphic tablet, then bo2 started to give some problem (like high sensibility, even if i put 0.5 that is the minimun), i tried to turn off windows ink or any other settings of the graphic tablet. I had the same problem on Osu, but turning off "Raw setting" or something like that and same aswell with windows ink solved.
any other help? now i can't play cause of it

When i join in a bo2 zombie match, mouse sensibility is boosted for no reason. I checked settings and mouse macros, nothing changed, i tried to play on bo1 and i have no problem.

when i try to invite more than one friend in a private match (zombie), he has a infinite loading screen, meanwhile the other one crashes