Gremlins!!!! I think you're eventually gonna have to check every connection in the electrical system at some point during the time you own/operate this vehicle.. so, the main grounding connection, the battery leads, the starter connections, the a/c clutch itself. Don't assume that any of this stuff is good circuit until you check it. Why not? Could possibly contribute to the symptoms that you are experiencing and could save you from some potential future problems.. I'm talking about the dark parking lot in December kind.