Sudden Unexplained Pitch and Yaw

My quad has had many flawless flights without any issues (100 or so flights).

Recently during a flight, while in stabilise and alt hold, it suddenly pitched forward (maybe more than 45 degrees) and yawed 360 degrees and then recovered. I'm pretty sure it wasn't from any of my input.

I'm hoping it's not from any hardware or flight controller glitch and am a bit concerned with it's reliability now. Thinking it could have even been from a bird attack maybe but nothing I seen in the video.

Attached is the log and here's a link to the video of the whole flight with the incident seen at 1:45. Gimbal didn't recover. https://youtu.be/2A74v_Evq0o

Would appreciate if anyone can have a look and provide any insight.

Thanks,

Richard

2016-09-06 10-36-52.bin

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