Black screen for 2 seconds

Daniel_430

Honorable
Feb 15, 2017
41
0
10,530
This has happened to me twice to day for the first time. I'm just browsing or writing on a document and the screen just goes black for like 1-2 seconds and then it just come back like nothing happened.
There is not warning nor anything. The monitor is on in those seconds.

What could be the problem?