Are you aware of any scratches or chips in it previously? I've read here and there that tempered glass can become volatile with even minor imperfections.
Out of curiosity, how cold was it inside and how hot outside? Was the Sun blaring on it from behind when it shattered? No-one as provided details on this, but I'm curious if temp difference has anything to do with it since they have a rather steep curve wrapping around to the side IMO.
Out of curiosity, how cold was it inside and how hot outside? Was the Sun blaring on it from behind when it shattered? No-one as provided details on this, but I'm curious if temp difference has anything to do with it since they have a rather steep curve wrapping around to the side IMO.