I had the mirror installed about eight months ago by a professional, and it has fallen three times since then, without anyone even touching it. The side pieces which are supposed to hold the mirror in place loosened over time causing the mirror to slip out of place, eventually causing this crack. Not a well designed tilt mirror, although it never truly tilted. Screws had to be adjusted to move it to the preferred position rather than being able to easily tilt it like previous mirrors I have had.