Thank you. I contacted my local Sony repair shop. Unable to call for 5 days,so I delivered it to them. 120 miles round trip. Given a Samsung set to use. Got this home, but it would not run for more than 2 minutes before switching off. Got a call today to say they had 'done a factory re-set' and downloaded new operating system. I thought this set automatically dowloaded updates? How do I perform a 'factory re-set' if it happens again?