Ours is popping even more than ever now that we're on concrete, especially the front right. Sometimes it pops when we're walking thru the bedroom but other times when there's no movement at all. Currently we're in Anaheim, CA where the temps have been freezing at night, warming during the day in full sunlight.
We're going to try wooden blocks and see if that makes a difference. (Not only is it driving us crazy but our neighbors as well.) If that doesn't make a difference, I guess we'll have to make an appointment to have it checked out. It sure seems like an ongoing problem with many of us, something that should be fixable.