Problem with a screen. Pebble steel


I have a problem. I bought a Pebble Steel a few days ago. And this is realy great. But at once come a problem with screen. Constantly appearing bands and this hinder for work. How can i fix it, or could you help me? Yet I have a photos from the screen. I can send it.
Sorry for my English. And I hope, that someone in Support can halp to me.

Thak you.