1) Start Arma 3 Alpha
2)Join a Graves YARD Co 30 AW Stratis Domination server(s). Other servers crash too, but I've been using this one for repeated tests.
3)Simply play for as long as you can.
It doesn't matter what I am doing. It can happen during flight, or while using the map, running around, engaging targets- it doesn't matter. Gear doesn't seem to change the end result. Nor video settings (in-game or out.)
As vague as these steps happen to be the game will freeze up, without fail, every time simply by playing.