Does it have plastic shields underneath. It's not uncommon for one of the plastic anchors to come out and the shield to slap up and down against the bottom of the car. Had that situation on my Mazda 6. Fixed it with a sheet metal screw.
These are actually Mazda's nanobots. Their purpose is to keep a smile on the driver's face by keeping the frame rigid, engine peppy and, more recently, fuel economy high. I think they call them Skyactiv or something.
Do the editors not read comments? I've posted a comment about this previously. There is a service bulletin regarding noise at the base of the A-pillars. The dealership should be able to help with that. Here is the TSB bulletin number: 09-001/14.
Need more detail than this. Is it speed-based? Regular rhythm? Could be something embedded in the tread. Other than that, I don't know. Window regulators are a common culprit.
@sterv We had this same issue on our CX-5 (first model year). It's the result of a couple of panels being too close together and rubbing/clicking when there's movement.
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