My 27' Led cinemadisplay turns off when I am working

Hello,

A couple of weeks ago, my Led cinema strated to turn off while I am working, it only turn on again when I unplug and lug again the electric socket.

I am already tried new socket, new cable. It happend in my office and in my house. So it is something with the display.

This now happend many times and its very annoying.

What should I do?

Thank you