My HR20-700 is hooked up to both satelite inputs and an OTA input. Tonight I had one satelite tuner and the OTA tuner recording different shows. When I tried to watch another channel (non OTA) I got the message "all tuners are recording" and the screen gave me the choice of stopping one recording. The HR20 manual clearly states you can record 2 channels while watching a 3rd, provided you are hooked up correctly, and I checked that both my satelite tuners work as well as OTA. What is up??