NHTSA Complaint #11494349 — 2022 HYUNDAI SONATA

When driving down a hill, I downshifted to slow my descent and to not have to use the brakes as much. I downshifted once or twice making sure the engine didn't go far above 3000 RPM. The gear indicator showed 2nd gear but I knew that wasn't accurate because the car had yet to change gear and the RPM was too low for 2nd gear, I was still in 3rd or 4th gear. About a second or two goes by until the car slams into gear incredibly hard, physically jolting me and the car. The engine revved up loudly to about 4-5K RPM. Had a car been closer behind me, they could have run into me. There were absolutely no warning lights or indicators before or after the incident. The transmission had been shifting noticeably more rough for a few weeks after and perhaps a bit before the incident. The transmission always felt rough up until 4th gear when travelling at slow speeds. but this was something else. It hasn't happened again to the same degree but there have been automatic shifts on its own that are uncomfortable feeling. I have not had the car inspected yet because it is difficult to find a dealership appointment that isn't 2+ months in the future. I had scheduled a full thorough inspection with all of my complaints but had to cancel to due personal reasons.