Car Will Not Accelerate problems of the 2013 Nissan Sentra

Tl- the contact owns a 2013 Nissan Sentra. The contact stated that the vehicle would not accelerate properly. The failure happened without warning. The vehicle was taken to the dealer where it could not be diagnosed. The vehicle was not repaired however the failure recurred. The vehicle was taken back to the dealer where the failure occurred again which resulted in a rear end collision. The vehicle was repaired however the vehicle made an abnormal noise and the vehicle hesitated. The vehicle had been returned to the dealer where it was diagnosed that transmission was defective and needed to be replaced. The vehicle was repaired however the failure recurred. The vehicle was returned to the dealer where it could not be diagnosed. The vehicle was not repaired however the failure. The vehicle was taken to a new dealer where it was diagnosed the transmission needed to be replaced. The vehicle was repaired however the failure still recurred. The manufacturer was notified of the failures. The failure mileage was approximately 25,000. Kh.