Just built a base, where even the ground floor, i filled with pillars, everything was 100% stability. As I was finishing off my second level, walls started to fall.
Stability from the ground up means nothing right now, it is broken.
If you stand on the outskirts of someones cupboard border and they have a completed base, and build foundations just inside their build area, the more you put down, you will see their base start to fall apart, try it yourself.
I really hope they sort this for Mondays patch, it's kind of pointless building anything right now, unless you stick to small and no towers.
Proof you can get stability from the ground up...and not by just building single block towers





https://imgur.com/a/HyIEh
there are problems at times but it seems random. some parts are fine but sometimes some parts are completely rebellious and refuse to exist