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Hello, I've had a similar problem under hard acceleration, and in my case it turn out to be the throttle. First check if the throttle is well calibrated. For some reason, my throttle kept getting out of range when turned to maximum acceleration, which cuts out the power.  I did the re-calibration and it solved my problem at least temporarily. Then, I ended up replacing the magnet, did a re-calibration routine and I  haven't had any problems since.

Regards

follow procedure here: https://visforvoltage.org/comment/29578#comment-29578