I was in Sharog, being chased by numerous zombies. I ran up into a military tower and they followed. I started to fight with my fists, then I fell through the map. Constantly falling. I was still being hit. I got knocked out then right back up within a second, still falling. I was bleeding and couldn't stop my character from falling. I logged out and logged back in, and respawned as a new character. I have been falling through the map multiple times since the latest update.