After tv is on a few minutes the screen goes black. When turned off and back on it comes back, but goes out in minutes again. The tv is just a couple years old and well taken care of. I can not get any help on company website. They insist the model doesn't exist. It appears there are about 8-10 Toshiba 4K models doing the same thing and people aren't getting answers. If this is a company defect I think they should at least address the problem