In T124112#1671489, @TheMasterofBlubb wrote:

Hey guys can you try the dev and RC build. I yesterday played with a friend and he was sure he had not the bug anymore

Not to point out the obvious, but the problem still stands. I know this is obviously a very complicated problem as this has taken over a year to try to solve but the least we could get is an update :/ Or at least advise us in whether or not we will have to play 32bit for the remainder of the game's lifetime into ARMA 4

Same problem.
Many too.
https://steamcommunity.com/app/107410/discussions/0/135511913384223613/