code 771 signal loss ln 2 all receivers - DirecTV

I had a sudden signal loss ln 2 message on all receivers on most HD channels. This was noticed on Saturday, Nov 4th. Network HD channels OK, Movie Channels OK, no pixelation or code 771. It is the cable networks such as HGTV, Discovery, Food, etc., where the problem is. Signal strengths on both receivers high 80s to high 90s. Receivers have been refreshed and reset and the signal splitter has checked out OK by removing the coax from the dish to the splitter and attaching it directly to one receiver with the result of getting the same loss of signal message.

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