I have an ONN Roku TV and get a black screen on all the apps

I have a 70in ONN Roku TV that’s only 2 years old that started doing the black screen about a month ago. I don’t have cable and only use WiFi for streaming. There is nothing plugged into the TV at all. The only cord used is the power cord. I have tried unplugging the TV, I’ve done a factory reset, I’ve tried power cycles, nothing has helped. It happens on all the apps that I stream on, Netflix, Hulu, Disney +, Apple, etc. I am very upset that I paid this much money for a TV and 2 years later have to replace it. After seeing the other reviews, it appears it’s  a manufacturing issue. I have to power down the TV for several hours before the screen will work again and once the TV has been in operation for a few hours, the screen will go black. I can power off and resume programming again but it will go black again and again and the time between the blackouts gets closer and closer together until I finally have to just wait several hours again. This is frustrating.