One of our members is reporting that this can help solving the issue.

In the start parameters of the game set the following setting:
Code:
-malloc=system

Eventually, the file "PhysX_x86.dll" inside the Arma3 installation directory can be deleted/renamed to address the issue.

Also, it's recommended to delete the mission-cache which can be found under the path:
%LOCALAPPDATA%\Arma 3\MPMissionsCache

I just started experiencing this today on Dev branch with the 64-bit build on my server and huge pages enabled. Been experiencing it on two separate mission files I made myself. It seems to only happen to me when the mission has already started (JIP). It doesn't always happen but once it does it will happen consistently until the mission ends. A friend and I have also been getting occasional crashes mid-game as well.

One of the missions that I experienced it on:

Just discovered that it might happen persistently when joining the server after the mission has started, but not when JIP'ing the mission if already connected to the server. So I apologize if this is in the wrong thread.

Edit:
Disregard everything. I just realized I was accidentally launching with my modpack installed while trying to connect to a vanilla dedicated server. Issue no longer occurs once launching without mods enabled. Strange that this only seemed to happen during JIP.