On occasion, my HR10-250 reboots itself. I've never worried about it. Stuff happens. Lately, after rebooting, it sometimes tells me it cannot connect to the satellite to get the guide info. As we all know, without the guide info, a TIVO unit is helpless to do anything but watch what is already recorded. If I test satellite strength, it tells me it's fine. If I do a System Test, it tells me there is no Sat In. Invariably, the problem corrects itself. It finds the satellite and starts recording normally. I have a spare unit and would like to find the problem. So, my questions are: Where should I start swapping components? What components can I swap without having to get a new card from Directv? Thanks for any and all suggestions.