While cutting soybeans last week i got an error that read "no terrain corrections" every time I came to the end and turned the steering wheel to disengage the ez steer. I unplugged to power to the ez steer box and it came back and would work until I came to the end again and tried to disengage by turning the wheel. If I disengaged the ez steer with the remote i would not get this error. Whats up?