Something I see in spring often, besides tree branches flapping in the breeze in front of a signal, is water inside LNBs. In climates where it gets hot in summer and freezing in winter the lnb cover will sometimes crack and then you actually see water inside of it. Sometimes it looks like just droplets on the inside, other times its enough to look like a water bottle on its side. If you can access this dish, I'd look at the LNB (the eyes) and see if you can see moisture in there. The solution to this is easy, new LNB.