Q.sanseveria
I got this plant from my dad. its in a big pot leaves are two feet ish high I read don’t water toomuch once every two or three weeks from the bottom well I been finding stems rotten and the leaves rise to the top of dirt and leaves bend over what is causing this and how to transplant leaves when I cut rotten end off

I got this plant from my dad. its in a big pot leaves are two feet ish high I read don't water too much once every two or three weeks from the bottom well I been finding stems rotten and the leaves rise to the top of dirt and leaves bend over what is causing this and how to transplant leaves when I cut rotten end off