Thumping from rear.
I own a 2016 Tucson and have heard from day one what sounds like a muffled thump or pop coming from the rear of the vehicle,,underneath,when the vehicle reaches exactly 19 MPH. Only heard once after startup and placing into drive then at 19 MPH then not again. Will not repeat until engine is turned off,restarted then placed into drive. I can repeate the process with the same resulting thump every time. Can it be something within the fuel tank resetting itself after each start up?. Dealer has no expaination.