Motor noise and lack of torque when trying to increase speed

[electric_vehicle_lover]

My good cheap generic EUC that I use for the firmware development, sometimes when I take it for a ride, the motor makes noise as if the power is being cut when I try to accelerate... I can balance on it but can't accelerate as the motor don't and starts making the noise... and if I try run over a small dump, I will fall.

I tried the connect well the motor phases and hall sensors... as I am always unconnecting them for the firmware development.

This happens the battery is fully charged or with middle charge.

I just can think on a bad circuit, for the current and/or over current but would be strange because the problem happens just sometimes, not always. The problem may disappear some hours or day later, without doing nothing.