Screen goes on and off while gambling?

My screen always goes on and off while gambling.
But even only in Final Fantasy, it happens quite often and very rarely at Minecraft.
That's just bim gambling, not if I watch YouTube or Netflix.
Graka can't be, she is only 3 months old.
However, the HDMI cable is also pretty loose on the graphics card.

Turn off Freesync directly on the screen and see if it disappears:-)

How does it work?

Freesync was never on

Ok… Was just a guess:-)