NHTSA Complaint #11612102 — 2019 CHEVROLET CORVETTE

My 2019 Chevrolet Corvette Stingray, the transmission system along with the torque converter began to malfunction as the car seemed to change from different modes. This malfunction caused the transmission to shudder, which caused a very bad vibration while accelerating and driving between the speed of 25-70mph. These actions or behaviors by the car surely poses a control and stability risks well as a safety risk for everyone on the highway and to myself. This issue was confirmed by the GM dealership I took the car to on 8/23/2024 and they said they could not get to it until 9/9/2024 and they will have to do a triple transmission fluid flush based on a service bulletin (TSB 18-NA-335) which was issued by General Motors. My car gave me no warning by way of lights or messages within the car. I would like to know why this repair is not covered under the service bulletin since General Motors knows this is a issue with the cars.