I just got back from a vacation to find on both my SV8000HD and CS7000PVR I have signal but 0 quality. I updated to the latest BINs for each, no help.
Since it's affecting both, I'm assuming it must be something in common, like the LNB or cable from the sat dish to the switch, ? My problem is my roof is really high up and I don't think I can get to it in rainy season myself to check things out.
I'm also in Costa Rica, and the guy/company who installed my dish three years ago have passed on (literally in the guy's case).
I'm hoping it might just be some huge clouds someplace blocking me out, but I doubt it as even in the hard rain a few channels like USA or MTV get at least a few quality points (even if not enough to see a clear picture).
My dish is 1.8m in diametre and aimed at 119W if it helps.
I had the same problem a few days ago when there was some very heavy overcast. After the rain the quality came back up and I was back to watching TV. Good Luck!