Ideas
After taking few days off, I immediately noticed this in first game, I had it to happen pressing counter strafe A and D, and also single S presses caused this after restart (thinking the counter strafe problem was gone lol), with the MSI AB switched of it happened only with Q (spotting) so far.. either way there is no way this is AB fault, you are not supposed to get in game stutter after tapping S for example, which you do in every second gunfight if you are not bot, the randomness of this confirms further its issue with the game.. its not the first time things are broken after hotfix, remember bloom, IFV, stealth jet AA missiles..
at this state I cannot play, I hate stutter and makes me motion sick
update: turning off AB makes the stutter less annoying (weaker), but its still there, also even in vehicles which is huge problem for pilots