Has anyone notice any cracking sounds from the wheel covers? I don't hear it when inside the car, but if my wife drives and I'm outside, one of the aero wheel covers makes cracking noise when it rolls. Its as if the cover is under excess pressure. At first it was the front driver's side wheel. I took it to service and they replaced the cover. Now its the back driver's side wheel. (I feel like they may have just swapped the covers).