The contact owns a 2021 Ford Explorer. The contact stated the adaptive cruise control and the collision avoidance systems would malfunction. The vehicle would suddenly deactivate the cruise control and the collision avoidance would detect a non-existing object and stop the vehicle from also turning to avoid the crash. The contact stated that while idled at a stop light when the vehicle suddenly accelerated rear-ending the vehicle in front. The air bags did not deploy however the acceleration did not reach high enough speeds for such a response. A police report was not filed. The vehicle was not towed. There were no injuries or medical attention needed. The contact took the vehicle to the dealer however the vehicle was not diagnosed or repaired. The manufacturer was made aware of the failures. The approximate failure mileage was 10,000.