Gimbal Roll Motor just shutting off when i move it in max roll Position.

[Wachenanggo]

I have this problem when i roll the motor too much the gimbal just shutting off but when i restart it again the motor is fine but when i roll too much the motor again it just shut off again i already replace the potentiometer in motor driver. what do i need to replace to not have this issue again the roll motor driver or the GIMBAL FLEX CABLE. i have live view on the controller