Two days ago: Mine it occurs, although support beam. Half of my stock destroyed.
Yesterday: Mining door buggy. GM helps them destroyed. New door installed.
Today: Mine Door gone, just rock! New entrance created. All reinforced walls now only normal Walls!
Morning: If lava from my cave? Or the devil himself?
Finds funny, and I will not give up!
Addendum: After I entered the tiles, the walls were reinforced again! Mad ^ ^