My 2013 MKZ has the same problem. Ford dealer gave me a copy of Ford to dealer notice on this problem, which states it is considered "normal" after the car sits for a while. I'ts supposed to go away after you get the trans. hot. Mine didn't go away, it did lessen a little, but it still "bangs" into 3rd gear. Going to change ATF to see if it solves this problem.