I added an elevator to my map. It's a simple one using func_door and a trigger multiple. Everything worked fine when I was testing map, it moved up and down just perfect, over and over again. I put it on the server and it worked at first but then sometimes it would get stuck at the top and not come back down. Then we noticed sometimes when you got on and started riding up you would get stuck and could not move. How do I fix this, what did I do wrong? There are no multiple stops. Just a single stop at the top and back down.