Have you checked the antennas on both? I know the reciever has a slip on connection inside the casing on the board, also have you shortened the antenna at all on the reciever? Trying contacting Spektrum and explaining your problem or going to their website and viewing their FAQ pages. Or look on the Horizon website for contacts, FAQ's or recalls for your radio. Only time I've had problems is with low voltage on the batteries never had any other problems with my DX3S and 3 recievers.