This TV is just a few years old. We turned it on today and it immediately powered back off. We noticed after this happened, the power button on the TV flashes at us continually, as though it's giving us an error code. When I disconnect the TV from its power supply, reconnect it and turn the TV back on, it does the same thing. When I turning it off and on without unplugging it, it won't function. Why is my TV not staying powered on?