Hello,
This problem happens to me since some days now. I start Dayz, find a favorited server, click on Play. I join the server and I play from 10 mins to like a hour. Then I loose session.
I log back, I can play from 10 mins to like a hour. Then I loose session again.
And from that point, if I try to join server again, after clicking play, I get a black screen, the fps goes down to like 5-10 for few seconds then goes up to 1000 fps, and screen remain black. I have to look for another server.
And it will happen with all others servers I will join.
I tried everything.