Others have reported this issue. I have experienced it in Houston with 2 different HR20s with 2 different AT9s. Analog audio is lost at the same time, not just HDMI, but only on HD locals. Some previous speculation that it is multiswitch/temperature related but I don't recall any definitive conclusion. However, same problem with 2 different units with 2 different dishes suggests it is either HR20 issue or problem with local feed to D issue.