I was driving down the highway when suddenly the sunroof of my vehicle shattered. glass flew down the back of the car scratching the back windshield and trunk. the weather was approximately 72 degrees fahrenheit outside with the ac set to 70. the sunshade was closed. based on the fracturing of the glass, it seemed as if the cause of the sunroof breaking came from inside the car. the glass was bowed upward and outward from the vehicle. upon review of dash cam footage, there was no indication of any outward or exterior source that would have caused the glass to break.