When playing on build 42 multiplayer on the newest version. (Save made before the update on the 18th of February) the game will randomly crash and freeze not just the game but my whole computer (never done this) and when the server is opened again, all the players have been reset to where they were from the last save and quit. But besides xp or injuries. Any zombies that have been killed, cars moved, items used or moved.
(Example started at the military checkpoint drove to army surplus store, game froze and crashed, restarted server, started back at the checkpoint, but the cars remained at the army surplus store along with any zombies we killed)