Each spring and fall, cable companies experience sun outages. For a period of about  a week, the sun causes solar interference to all geostationary satellite signals. As the sun's path across the sky gets lower each day, there are times when it is in a direct line behind a communication satellite that is sending signals to a receiving satellite dish here on earth. When the dish antenna is looking into the sun, the interference from the sun overrides the signals from the satellite. For more information, check out this wikipedia article.