On the screen appeared strip in the middle

Recently bought a new computer, which is nVidia GEFORCE GTX 1060.
The first month everything was fine, that strip on the screen was not. And now it has become manifest. And I noticed that when you turn it no, but it's worth it to run three hours, so it starts to appear. I thought it was the graphics card. I gave the computer a area of the day, then immediately after the computer is turned on FurMark for half an hour. Then shut down the program and the band is not found. But after three hours it again started to appear. I suspect that this monitor is buggy. Equally important caveat: the band is visible only if you take some dark grey or dark green. Band so and so is just in these backgrounds, it is better seen. Thin, dark and transparent, the center bends slightly.