When I log into dayz I get about 5 to 10 minutes of play time, typically my system restarts itself when I go to open the inventory, but not exclusively. Other times I'm playing the game normally, walking, in zombie fights, opening a door, etc. Never getting more then 10 minutes. I've recently, as in less than 24 hours ago, Reset my PC and started fresh but the problem persists. This problem started about 2 or 3 weeks ago.