I got this TV used and it came with the problem. Sometimes it just randomely turns off by itself. You can still hear the speakers buzzing, so you have to press power to turn off the speakers and then press it again to turn on the TV. Sometimes it turns right back off, and other times it stays on and we have no problems. To be honest, it's really irritating because sometimes it will take 20 minutes of Power button pushing to get it to stay on. What is wrong with the TV and what do I do to fix it?