DJI Wookong M Crash / Fell out of sky

Hey all, I recently had a crash with my S800. Here are the details: Copter was about 25 feet away from pilot, 10 feet in the air.
Locked-up, descended quickly in an auto-land on hard large gravel, props did not seize or stop rotating.
Copter did not react to any transmitter inputs. Giving more throttle as it dropped produced no results.
There was no warning, no visual vibration or any other indicator of imminant failure before crash.
Measured voltage on batteries after crash: 24.7V (crashed on first flight after full charge)

Failsafe was set to hover and we were using the DX-7 in atti mode. Anybody have any ideas as to what may have caused this or how to fix it?

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