some walls are gone

after restart some my walls is gone and its 2 floors with 100% stable and i cant replace it now? why what to do

unlucky. Another restart might fix it or make it worse. You never know.

same here

if they were high external walls im guessing they just decayed. i place a bunch yesterday and when i logg on this morning they had lost 500 health

Stability is supremely fucky. I’m sorry, but it’s really up to chance.