IMU flatline in pixhawk

THIS IS A CROSS POST AS WELL.  TIA!!!

Looking for some insights from the group on what may be the issue, and has anyone else had an IMU flatline and the rig end up on the ground in a pile of pieces? Here are two screenshots, with IMU and pitch/roll, and IMU and speed/altitude.

This flight was the second mapping flight and lasted about 6 mins until the crash from 300 feet.  

Thoughts?

150620_67bin-log_IMU_RollPitch.jpg

150620_67bin-log_IMU_AltSpd.jpg

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