This problem is caused by "stick-slip" of 2 rubber seals. As the body flexes, the rubbers variously grab and then release. Automobiles rarely use rubber on rubber seals preferring to opt for rubber against painted metal. Now, clearly, Mazda and its dealers are clueless as to a solution and seem to try various different things. To me, the "fix" has to either be more stick or more slip but not both. Thebriggie solution is to pad out one of the seals and create stick and the various different lubricants are to give more slip. I am with a modified Thebriggie so no sprays for me and everything is fine. Just decide which one is for you after 15 minutes digesting what has gone before on this thread.