I just got my 721 today. After work, I started the installation process. I ran the wires and installed it. It did not seem to take an hour to download the software from the satellite. It took me longer to have it authorized from Dish Network. After a few going back and forth, everything works fine except that I also have a 501 and the remote for the 501 is sending signals to the 721. My 501 is in a diferent room. Does anybody knows how to stop this?