Screen turns black or with pattern

Hey,
I noticed that, occasionally while online or not, the screen turns black and/or displays a moving pattern of colourful large dots (not contained in the display collection). The phenomenon vanishes as soon as I operate the keyboard or mouse again. Does anyone has an idea what that is? Please, give me some feedback. Thanks!

I take it you've checked the settings for display sleep in System Preferences > Energy Saver?
Also check in Sys Pref > desktop & Screensaver > Hot Corners to see if display sleep and/or screensaver have been set to operate if the cursor strays into a corner.

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