We were noticing that it appears to happen on PS officials when someone is logging in. It’s usually a player we know has a large build.
I have been checking the player list every time, and it lines up. Someone in chat always mentions it, and then the rest of us will fall if we are on foundations. I fell through the foundations at the main build, and then through the cliff overhang to the valley waaaayyyy below. Had to recall my body, so, that was fun.