Well, this is kind of a tough one, and if everything is really going the way you say, the likely only way to fix it is to start by checking all the connectors to make sure they are tight. Then, move on the replacing things one at a time, right on down the line.
Just MOVING the dish might be jarring a 'bad in some way' connection, and that might be what's going on. Sometimes the stinger wire (center wire) in the coax is a little too short, and as temp changes, it can retract back out of the connector. Just enough to cause issues. You then move the dish, and that's enough to make it re-connect.
So, it's going to be careful observation, and trying various things in turn to find out what's really happening. Personally, IF you have another receiver to try, I'd try swapping that in first...
Oh, and ask a mod to move your thread to the FTA section, where it's likely to get more responses. This forum is more for support of issues you might have with the forum or website in general.