Pixhawk Failure

Really need help. Pixhawk in our QAV 540 has been flying great for months. Until yesterday there was a catastrophic failure on the second flight. Launched in loiter flew up approx. 20 feet, moved left over a cliff, suddenly it just fell from the sky. Looks like power just ended or something, turned over upside down and cash. Total write off. I have attached the last 3 files from the SD card. We are of course very concerned about the unpredictability as we have three other builds underway. Can you please have a look to see if you can see something?

155.BIN

154.BIN

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