So every survivor has a role depending on what you tell them to do (dustman, guard, worker, ect.), with the player usually being the leader, however recently one of my workers suddenly stopped answering calls. When I went to check him on the survivor menu, he no longer had the role of worker, but a large string of numbers (8401115060 to be exact). After a couple of days in game he suddenly just showed right back up and his role was back to normal. Do survivors go get lost or is this a bug? Whats up with the large string of numbers?