Yeah, I have the same problem quite often. Most of the time it's because of trees. With this particular dish, you really need a totally clear sky. I spend a lot of time leveling, setting up, etc. and usually to no avail. My wife goes out and kicks the dish, puts a few rocks underneath, and gets me a signal every time. Darn her! Anyway, I just keep going through the whole process over again a few times and sometimes I hit all 3 and sometimes not. I know how frustrating it is cause all I want to do is set it out and watch TV. We actually had much better luck when we had a tripod and DirecTV, but I got this setup for HD and the ease of setting up. Yeah, right. So keep trying, and you are now at the point where all you can do is try to figure it out yourself. Good luck, and let us know.
EDIT: I notice you are able to get all 3 when you go through the process in the morning. Last weekend camping, we never could get the third satellite, so you're doing ok. I have no idea why it needs to recombobulate every morning, but we have had that problem also. Not all the time, but sometimes.