The contact owns a 2022 Tesla Model 3. The contact stated while her husband was driving 50 mph on cruise control, the vehicle began to decelerate independently. The contact stated no warning light was illuminated. The contact stated they continue to experience the failure five to ten times on the first trip. The contact stated she also experienced the failure on 9/23/2022, while driving 80 mph on cruise control, the vehicle began to decelerate independently to 70 mph and deactivated the cruise control independently. The contact stated no warning light was illuminated. The contact stated the force of the deceleration caused the seat belt to retract and caused her to have whiplash and headache left side of her head. The contact did not sought medical attention. The contact continued to experience the failure while driving to her destination. The contact stated she experience the failure for a second time on 9/25/2022. The vehicle was not diagnosed or repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 1,000.