Sabre Crash on Autotune Uncontrolable Throtle

Hello friends:
I am writing to please help me solve the mystery of this cruel accident. On the opening flight of my SABRE UAV in the Autotune process I suddenly lose control of the plane which accelerates brutally and turns to the right. I lose total control of the plane no servo responds and finally crashes.

I flew with a Pixhawk, 4S 4500 800KV Engine 11x6 Pusher. Inmersion R / C long range installed on a Taranys 9XD
Before that the plane flies well for about 4 minutes. 

I enclose the Pixhawk log for review and comments.

https://www.dropbox.com/s/6d5qeki6q7...26-05.BIN?dl=0

After the accident I was able to retrieve the plane almost completely. I did not find evidence of mechanical problems in the elevator. Neither in the ailerons.

There were vibrations right after I lost control but I do not know why they were generated.

I was able to retrieve a gopro camera that recorded the entire flight.

Here is a link to the video for you to see.

https://youtu.be/8jO86cuAorM

Thanks in advance

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