I took advantage of the loyalty offer and ordered an HD DVR, my fourth. I received a refurbished HR21. It works fine until I try to record something. The recording works ok, but I can't watch live TV, I get the "searching for signal..(771) error on all channels. When I stop the recording, live tv comes back. Is this a common bug? It has the latest NR on it. I haven't tried calling support yet, but I will sometime this week. This is the first problem I have had with any of the DirecTV™ boxes I have gotten including two H20"s.