Samsung Smart TV Cuts on and off after screen glitch

I have a Samsung UN55ES7500F smart TV. Over the past couple of months it has started cutting off and back on on its own. Every time it does so, it is preceded by a couple seconds of a screen glitch for a few seconds, usually colored lines or a solid color. It then cuts off and cuts back on and the screen is fine. First it happened once a day or so and now it does it constantly, occasionally fixing itself for a few hours. I'm using another TV now, and have ordered a new power supply board in hopes of that fixing it, but it hasn't arrived. I've noticed if it's been working for a while, it usually starts doing it again if a button is pressed on the remote, volume or input usually. A coworker said he thinks it may be a different hardware problem because of the accompanying screen glitch, but the screen isn't otherwise damaged and once it powers back on the screen is fine, at least until the next power cycle. Any ideas?

EDIT: I should add I unplug the TV to get it to stop. It always powers on after cutting off. There is a (green I think) light that flashes when turning on and when pressing a button. I assume it's the standby light. The back right of the TV gets quite hot, where I believe the power supply board sits. At first I thought keeping it cool was fixing the problem, like with a fan, but it may have been a placebo because now that doesn't work. That's all the info I can think of.