The contact owns a 2022 Tesla Model Y. The contact stated that while driving at various speeds with the Full Self-Driving (FSD) activated, the destination was entered, and the system announced the direction steps when suddenly the Full Self-Driving (FSD) disengaged independently causing the driver to be required to take control of the vehicle. During the independent disengagement of the Full Self-Driving (FSD), the vehicle abruptly decelerated. The contact was concerned that the failure could result in a crash if a rear vehicle was tailgating. In addition, the contact stated that the Full Self-Driving (FSD) independently disengaging occurred during excessive sun exposure weather. The Tesla Service Advisor was informed of the failure and advised the contact that moisture entered the camera and the windshield causing the failure and it was a known issue but only an interim repair was currently available. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure. The failure mileage was approximately 35,000.