I would try to find out if it is tight/spasmed muscles making it pop up.

That's what made mine pop up and get stuck up.
I had to deal with the muscle issues first, then the rib,m later on if I did lift something too heavy I could tell it was trying to raise,so I usually stopped doing the activity , but if I couldn't and it did raise my chiro dropped it drown.
After a few months of no muscle spasms it stayed down..