Wiper problems of the 2011 BMW 528

While driving down the street at 40 mph I heard a loud explosion type sound. I pulled over after making sure it was safe and noticed my sunroof glass had shattered into a million pieces. It looked as if it had exploded from within the car outwards. I contacted the dealer and BMW of America and both said that it was not recalled and they had not heard of any incidents such as that. BMW of America suggested I take my car into the dealer and have them examine it at my expense.