screen fades to black

My tv after of about 30 min will fade to a black screen from left to right still have sound but no picture.

I have tried unplugging different hdmi ports , blue ray , net flix , and cable boxes all same result .

When it does happen I can turn it off an then back on an it plays not as long but fades from left to right till a black screen , .

anyone help it is two years old this jan 2016 an has been babied an maybe running time total 9 months surely samsung made a better prduct than this ,