Bought a new 2019 Acadia Denali 3.6L in August. Immediately noticed a hesitation in the shifting gears mainly from 1st to 2nd and 2nd to 3rd. Even on the downshift sometimes. It feels like the old manual transmission, everyone in the car gets "leaned" forward and jerked back. The dealer tried to rebuild it with new seals, same problem. Dealer put in a brand new transmission, same problem. I'm ready to return this car. Anyone else with a 2019 or near notice a similar problem?