I have had a TiVo Premiere XL set to record 60 Minutes on a season pass (OTA) for months. Last night, TiVo failed to record it. The menu lists a partial recording of 3 minutes, however, that too is futzed. When I try to play the partial recording, it plays nothing, but goes directly to the menu where I am asked if I want to save or delete the recording. Any ideas to explain this failure?