For many people, this issue is linked to a malloc (memory allocation) used by Arma 3. One way to solve this that has worked for others, is to go to your DLL folder in Arma 3, and delete the .dlls that are in the folder. These are malloc files, so it's safe to delete them. Worst you, you can always validate your game cache to re-download them. Give it a try, and see if it works for you.