Cruise Control problems of the 2017 Hyundai Sonata

While driving on the highway, a notice was shown on the dashboard that the hybrid system and cruise control system were no longer functional. The vehicle then started to accelerate, uphill, without the gas pedal being engaged. The vehicle was taken off the highway and when coming to a near complete stop the vehicle stopped working completely. After restarting the vehicle and driving it to a safe place to park a notice indicated the breaks were no longer functional. The car was subsequently towed. The vehicle has had numerous repairs since and is still experiencing the same issue(s) as of 12/05/2019.

I was driving very slowly to make a turn into my garage when the car accelerated on its own and hit the side of my house breaking through a patio guard rail. The front wheels of the car went over the bulkhead. Insurance company sent a wrecker to retrieve the vehicle. The insurance company totaled the car. This unintended acceleration had occurred once when I was driving on a state road in cruise control when the car accelerated beyond the set cruise control speed. This occurred again on the day before the accident. This unintended acceleration had also occurred when my husband was driving the car while in speed control.

Issue: cruise control speeds up too much going uphill, and slows down too much going downhill. Description: I set my cruise control to 75mph, the car will go over 77mph when going uphill, and slows down below 73mph when going downhill without any driver input. This doesn't occur on other gasoline only Hyundai I drove such as santa fe. It only happens on my Sonata hybrid. I guess Hyundai may need to look into how the electric motor works with cruise control.