Dear DJI

I have an issue with my X8 which happens when i fly backward and then proceed to come to a standstill.
at this moment the drone proceeds to yaw left 45deg then yaw right 30deg, afterwards returns to original heading.
It's very consitent and the amount of drift right and left increases by the amount of pitch applied to brake
this happens in both Atti and Sport mode.

the airframe:
Gryphon x8 Z arm
castle creations 40HV
Rctimer x6 brushless motor
18x6.5 props
2x 6S 16000 lipo.

firmware has been updated to the latest version from October 21st 2016.

the issue has been happening for the last month of flying and has gotten worse now because of wind speed.
I have tried to change the yaw gain values to 120 / 100 / 90 / 85
the result was that higher gain causes the drift to become more.

please assist

Here is a Picture of the x8