Curious, I'm having a similar problem. When the game freezes, is it a hard freeze (I.e entire computer freezes, can't alt+tab, ctrl+alt+del, ect.) Does it always happen? Also, have you tried reinstalling the game, and replacing the battleye client? I will suggest something that helped me for a small amount of time, but I'm not sure how well it will work if your problem is the same as mine. Go here (http://www.battleye.com/download.html), download the battleye client for dayz, and replace the one in your dayz folder with this one. This should let you play your game longer (When I say longer, maybe for about an hour before it freezes.) This works for me sometimes, but not always. It's nice to see other people are having the same problem as me.

Well I somehow fixed it. Don't know what it was.
I changed the server, set the graphics back to default again and again back to almost lowest settings. Havent had a crash in 5 hours now.