With the recent 1.44 Arma3 update, it appears to have made the Arma3 server client less stable and more prone to crashing.
Wilco is working closely with the Arma3 devs to try and resolve the issue, unfortunately at the moment, there is little that can be done, as it's a fault with the Arma3 software itself that only really Bohemia will be able to fix.