Just as summary indicates: after 5-10 minutes of gameplay, it crashes. I've even opted into the DayZ experimental to see if it changes anything: it doesn't.
I have noticed that it seems to happen when buildings are visible. One time I spawned way out in the wilderness and 30 minutes later when I finally found buildings, it crashed. Prior to the 44.123800 update, this never happened - I was able to play for hours on end with no issues. then 44.123800 came along and I haven't been able to play for more than 5 minutes. I fully understand the game is in Alpha, but I can't even play it to find bugs! I want my money back and just wait until DayZ is released full.