When I attempted to record programming, I received an "error #81" on all three of my R10 Tivo boxes today. It stated that my DVR service needed to be activated? I've never seen this before. My HD Tivo was fine and able to record. When I called D*, they said they would take care of it. After unsuccessfully trying to deactivate and reactivate my Tivo boxes(access cards), the rep. finally said to unplug the receivers for 30 seconds and let them reset. I did and all is fine. Anybody else ever have this happen? Any thoughts as to why?