I have had this issue since the game came out and I still have this problem. I have tried with reinstalling dayz, run different steam versions (beta, normal) and nothing have changed. I have tried to run the game in administrator mode, turned off Anti virus etc with no further success. Have tried to turn of SPI and QOS on my DLINK DIR-655 with no success. Sometimes you are lucky enough that you can play for one hour, sometimes it crashes while loading into a server. Posted a feedback thread 4 months here: http://feedback.dayzgame.com/view.php?id=7677