This happens to everyone I think, sometimes your running around to find a city or just looting(didn't happen when looting but maybe it does to others) and you get teleported back, when you teleport back you can't move and can't access your inventory and can't "ESC" your way out so your forced to force the game to close, I dunno if this happens on higher pinged server or on any server with a problem, the teleport is random and when you get back in the server you can start moving but on the same place you got teleported to, maybe a huge desync?