@CliPeuM, would you be able to try:

... reproducing the crash by joining the server again?

... playing on other multiplayer servers such as official servers?

... playing single player missions such as campaigns, showcases, and challenges? As with the above this is to help diagnose the issue.

Try the below possible solutions one-by-one:

Try restarting your computer and then verifying the integrity of the game cache for Arma 3.

1. Restart your computer and launch Steam
2. From the Library section, right-click on the game and select Properties from the menu.
3. Select the Local files tab and click the Verify integrity of game cache... button.
4. Steam will verify the game's files - this process may take several minutes.

Try resetting the launch parameters to their default state via the Arma 3 Launcher. Also check under Steam → Arma 3 → Properties → General → Set Launch Options...

Exception code: C0000005 ACCESS_VIOLATION at 018DA6A6

Try all of the possible solutions listed for 0xC0000005 - ACCESS_VIOLATION on the Arma 3 Unusual process exit article on the Bohemia Interactive Community Wiki.

Try switching to and playing on the profiling game branch. After downloading new data verify the integrity of the game cache.

• profiling branch (special performance + profiling build - requires access code: CautionSpecialProfilingAndTestingBranchArma3), alternative download of needed binary possible from Dwarden's dropbox

If the issue persists after trying all of the above possible solutions then use the Arma 3 Launcher to prepare a new troubleshooting report and then upload the report to the feedback tracker for the developers to review.