Stanard alpha release will often crash at loading screen whilst developer build always allows me to join multiplayer games then play for a period of time 2-10mins before crashing. Issue becoming steadily worse, developer build used to be rock solid, not the case now.
Dumps can be found in http://feedback.arma3.com/view.php?id=4965 , just raising a different defect for the crashes/lockups when using the developer build.
Thanks