You are tending to have these problems more overnight?
Do you have replacement RG6 compression connectors? I'm starting to think it might be a suck out problem. In the cold, the wire can shrink up just enough to pull apart at the connector.
LNB still most likely. Hard to call it though....
When this problem first came up i originally thought the weather had something to do with it too but over the last 4-5 weeks i have come to the conclusion that its not. I was hoping i would find ice/water inside one of more of my connections or just a bad connector but i found none. I have taking a hard look at all of them and all look fine. Also the problem comes and goes on its own schedule. It does happen more at night then day but then just to piss me off it will happen on a sunny day at 1:00pm when the temp is 50 out so go figure.