Hello. I got an old 2 stop otis lrlv hydro that shuts down every day. I have yet to witness the problem. One report said they heard a buzzer going off. I found it shut down on both floors with doors closed. Recycle the power and away it goes works fine until I leave lol. I have gone over all door locks and limits and have the doors working good as I can see. I also replaced the marshmallow rollers on the switch tree because they needed it. Does any body have an ideas what this could be ?