When I started lowering it today, it didn't go anywhere. Then the front "fell" a couple feet.
I tried lowering it some more and the left rear fell, and finally the right read until it was all about half way down. I lowered it completely and had to raise it a little to tuck in a corner so it would close properly. It raised ok for that final tuck in to close. After this experience, I wonder what's going on and whether I should get it serviced before I use it again. Pop-up is a little over two years old and has seen light usage.