Monitor every few minutes black

The connection worked without problems and the image (1920 x 1200) is represented tatellos. Unfortunately, it happens every few minutes to the fact that the screen is completely black. About three seconds later, the image is then returned.

So the adapter for me is not to use. For the price, however, the cost of resending to me not worth it, so do I dispose of the adapter and I look around for a better alternative.