A friend of mine has three Directv SD receivers hooked up to a three lnb dish. With two of the receivers there is no problem at all with reception. The third receiver needs to be reauthorized before each use. This receiver is only used sparingly. None of the receivers are hooked to a phone line. The wire to this receiver has been replaced. He has never "moved' or tampered with any of the components. Any ideas, Directv just reauthorizes the receiver when he calls.