I tuned to an OTA station and it said "signal loss...". I checked all OTA stations and they showed the same issue. On the TV tuner, they were fine and were all above 60%. Back on the AM21, still "signal loss" but the signals were all around 80%. I reset the receiver and the first time I tuned to an OTA station, it was fine. Checked another... Fine. Back to the first and "signal loss". Is my AM21 dying??