I see a lot of that, never had the issue myself, and random and hanky have been playing with me all weekend with no issues either. Maybe the version of the game you're running could cause it, so many variables with dayz it's hard to tell.
When I use the ingame server browser a lot of servers dissapear when I click on them. My brother said he'd sent me a couple of routers, so I'll wait until those arrive then. :p