The contact leased a 2019 Hyundai Tucson. The contact stated on four separate occasions while driving and without warning, the vehicle jerked and lunged forward. The contact then stated that the second time while idled in line behind another vehicle, the vehicle jerked and then lunged forward. As a result, the vehicle rear-ended another vehicle. The air bags did not deploy. No injuries were sustained. No medical attention was required. A police report was filed. The contact then stated that the third time while stopped at a stop light, the vehicle jerked and lunged forward almost causing the vehicle to rear end another vehicle. The contact also stated that a fourth time while idle, the vehicle jerked and lunged forward without warning. The dealer was notified of the failure and informed the contact that the jerk happens. The manufacturer was notified of the failure where it confirmed that the vehicle jerked but did not offer any further assistance. The vehicle was not diagnosed. The failure mileage was approximately 22,800