We are trying to bulid a robot for our project. We got 4 servos mount to the wheels, and the servos have been modify already. We also write a simple coding to test on the controlling of the servos. However, 2 of the wheels are just rotating automatically no matter what. With our coding, we can still change the speed of it, but we just can't make it stop. So we reset the board to erase all the code, which the servos/wheels should be stop, but those 2 wheels are just keep rotating. Does anyone know why?? We are thinking maybe there is some coding already set in the servo, but we are not sure.