Flickering thunderbolt display

I love my screen but it's getting worse and worse. It offen flickres or just goes black. The screen is just a little bit over three years now so out of

warrenty and I actually just bought a new MacBook Pro 15". Nowadays I can barely use my screen without it going black. I noticed that even if I

touch my laptop or cable whatsoever it goes black, but it sometimes also goes black while I am barely moving?

What can I do?