Electrical Jack problems of the 2018 Toyota Sienna

The pcs stopped our van abruptly with no warning and did not slow down. Cruise control set at 75 mph north bound on TX hwy 69 between alto and rusk, TX. No rain smooth road late at night only the car in front of us. No other traffic. I screamed. Husband had fallen to sleep at the wheel even though we had taken a long nap in huntington, TX. We were on our way back home from my sister's funeral in nederland, TX. . I could see inside the read window of the car we stopped behind. No collision but injured my neck. Have medical records, was treated for neck injuries in jacksonville, TX and tyler, TX.