I'm confused now. I have had snails land upside down and die. I figured they starved to death, or were weak already for some reason. Maybe just old age??
But, if a snail can go dormant (wich I agree with), why wouldn't they go into that state after landing upside down?
I know they can "breath" upside down because I see them crawling on the underside of LR.
My theory is that they are just dying from natural causes, and land upside down.
I flipped one over a month or so ago and 10 minutes later, it fell off the rock and landed upside down again. Fixed it again and walked away. Later that day it was upside down again getting cleaned up by crabs.
I don't think we need to assume something is wrong just because a snail died. I wonder what their lifespan is in the wild.
Astreas are the worst for flipping over I think.