Yes, this happens all too often. (Corroded or dirty or loose connections.)
I just experienced this today on my Air Conditioner on the CLIPPER. The condenser fan was not coming on and after troubleshooting, it turned out to be the connection to the relay. Pulled the plug, and reinserted, and it is working, and we again have cold air.
"LOVE and LOSS, are two of the greatest emotions one can experience. -- I went to school to learn about "WHAT GOES UP MUST COME DOWN" but I had to live my life to learn the lesson of: 'WITH LOVE THERE WILL BE SORROW'."
David Stewart. (after loosing my NAVIGATOR)