I’m having the same issue on our 22 cx9 signature. I think it’s making our little guy sick or cranky in the car cause he seems completely fine in our other car with the same car seat. Does the rear axle replacement solve the issue? Or is it something else. Been to 2 different dealers and the 2nd one was more inclined to try and fix. There were 2 other cX9s with the same issue present that mazda keeps seeming as normal….