Elevator trim changes by itself

Have you disabled/removed all your mods and add-ons?
YES

Are you using Developer Mode or made changes in it?
NO

Brief description of the issue:
I set the elevator trim to neutral (green line) and begin the takeoff roll. Suddenly the aircraft starts to pitch up. I look at the elevator trim status and it’s all the way Nose Up without me doing anything. This happened before when I armed the A/P prior to takeoff roll

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Hi
I changed the Elevator Trim function on my BTQ from the trim switches (on AFC) to the trim wheel. This seems to have solved the problem???
Juergen