The shifting from 3rd to 4th gear would hesitate a few seconds, the rpms would ramp up and there as a rough gear change. This started occurring within weeks after I took the car ho,e and the mechanic tried to tell me that it was “adjusting to my driving habits.” I told him this adjustment was a safety hazard as there was a very noticeable hesitation in the changing of gears. A software update seems to have resolved this issue.