We now have a pretty good idea of why Russia's lunar lander crashed into the moon, it was due to a software error which failed to activate the inertial measurement unit, leaving the spacecraft unable to know when it had completed a critical maneuver. As a result the maneuver was performed for longer than intended leading the spacecraft to crash into the moon. Based on new information from Roscosmos latest telegram post https://t.me/roscosmos_gk/11053