Same issue of turning off and on randomly. 5 year old Samsung 46" smart TV was not connecting wirelessly. I hooked up via ethernet cable, no updates needed. At this point, I assumed it was the wireless LAN that was corrupt after some reading and the fact it would dump out of the wireless setup menu when I tried to connect. I unplugged the wireless LAN, both back panels had to come off. It was tucked up under the outside plastic back panel on bottom left side looking at back . One screw and unplug, simple clip to unplug. Essentially made it a dumb TV. I use wireless Roku box (prefer that over 2011 smart hub) to make it smart again. So far so good.