i just bought a used dji phantom 2, with a complete fpv setup and a h3-2d gimbal. i can only fly about 50 meter away before the controller signal is lost. the video stream to the monitor is still working well. i enjoy flying it allot and i fly it all the time but it kinda kills the mood when i cant fly beyond 50 meter away from me. is there somthing i can do to fix this?