VTOL airraft went in to spin mode after 5 seconds of transition

Hello Guys,
I have attached a log file for my vtol flight which took place on 4th July, 2019.
Plane took off in vtol mode to a height of 15 metres and was made to follow the waypoints in auto mode, after 5 seconds of transition aircraft was seen to be banking towards left but aircraft started spinning in clockwise direction viewed from top.

Kindly help me in finding the reason behind it.

Crash log

Crash log : https://www.dropbox.com/s/z8q843bmi62g8iu/2019-06-04%2018-44-54.bin?dl=0

What sort of airframe are you running?

e.g. an X-Quad configuration with front tilt motors?

I want to see if your case might be related to another couple reports:

Hello Mr. Evans,
Thanks for your reply.

I have designed a glider and the motors were placed in X configuration.
Attached is the video link for your reference:

Hariprasad Jain

Here is the youtube video link:

Without being an expert, could it be that your compass needs calibration?

Mentor, Is this a motor failure?

yes there is a motor or ESC fail in log