2020 Toyota Camry drivetrain & axles problems

During multiple episodes whether the car is at a stop or in motion there is a delay from when the accelerator is depressed to when the engine responds and revs leading to more power and speed. For example when stopped at a light trying to make a left turn, I press the accelerator down and there is no major change in speed and revs until seconds later when then engine then goes from 1000rpms to 3000rpms.

The contact owns a 2020 Toyota Camry. The contact stated while driving at approximately 40 MPH, the vehicle shuddered and stalled. No warning light was illuminated. The vehicle was taken to a dealer to be diagnosed; however, the failure cause was unidentifiable. The dealer informed the contact that the engine might need to be replaced. The vehicle was repaired however, the failure persisted. The vehicle was taken back to the dealer where it was diagnosed that the transmission needed to be replaced.