It happened again, this time no admin mode. I simply used the transport stone to a base in the south, stayed a short while and when I returned every single thrall that was standing on ground had fallen thru the mesh. It only happens at that one base location that is south of Carrowmore right before the ground turns to snow on a small rise. It does not happen to pets, golems, nor undead…only human thralls. I have to go into admin mode and ghost mode then go under the mesh to retrieve them. They are usually quite a distance down below the ground.

Edit: I think this may have something to do with the “return home” feature. Anytime they get pulled out of place by a purge or creatures that sometimes spawn nearby the return home feature kicks in and I’m thinking this is when they go below the mesh. Why they think “home” is hundreds of feet below the ground beats me but apparently they do.

They’ve been doing it enmasse lately because I’ve been simply pulling them in the approximate place they’re supposed to be guarding and telling them to stop following. For the time being I’ll try to be careful to manually place them on guard again anytime they move. That won’t stop it entirely but they shouldn’t do it enmasse again unless they all get pulled.