One receiver out of three not working

We have three receivers in different areas of our home. Over the past few weeks, we have perfectly fine service to two of them, but the third doesn't seem to be able to connect to the sattelite signal. I have unplugged and replugged everything connected to it in the house, reset with the red button, took the card out and put it back in, and also unplugged it overnight and restarted it. What would be causing only one box to do this? It runs through the set up like it is going to work, and then at the last minute goes back to searching for signal message.