In September 2007, a Proton-M/Briz-M rocket carrying Japan's [[JCSAT-11]] communications satellite failed to achieve orbit, and fell in the [[Ulytau District]] of Kazakhstan. An investigation determined that first and second stages of the rocket had failed to separate, due to a damaged pyrotechnic cable.ref
In July 2013, a Proton-M/DM-03 carrying three [[GLONASS]] satellites failed shortly after liftoff.ref The booster began pitching left and right along the vertical axis within a few seconds of launch. Attempts by the onboard guidance computer to correct the flight trajectory failed and ended up putting it into an unrecoverable pitchover. The upper stages and payload were stripped off 24 seconds after launch due to the forces experienced followed by the first stage breaking apart and erupting in flames. Impact with the ground occurred 30 seconds after liftoff.
The preliminary report of the investigation indicated that three of the first stage angular velocity sensors, responsible for control, were installed in an incorrect orientation. As the error affected the redundant sensors as well as the primary ones, the rocket was left with no yaw control, which resulted in the failure.ref Telemetry data also indicated that a pad umbilical had detached prematurely, suggesting that the Proton may have launched several tenths of a second early, before the engines reached full thrust.