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Hello, thanks for posting
By any chance did you take it to the dealer while it was still under the 3year/36K warranty?
If it was a loose door you should be able to duplicate it by pushing/pulling on the door, it sounds more like a suspension noise, possibly a loose sway bar or the sway bar links in the back. It could also be a loose exhaust pipe or muffler due contact with the body for some reason. Is the noise ever there when going straight over rough pavement?
does it seem to ne coming from the inside instead?