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When I run a full-screen game on my first monitor both starts to switch

I have the problem I mentioned before, as you can read, when I try to run a full-screen game in my first monitor, both of them starts to what it appears to switch, my first monitor disconnects and then my second monitor do the same, then my first monitor reconnect again and my second monitor reconnects again, this happens in a infinite loop which I can only break with unplugging the second monitor o the first.
This didn’t happen ever to me and It comes mostly from nothing, one day just did this and it didn’t stop until the day I’m writting this.
Could anyone help me?

PST: I’ve already tried to disconnect the monitor, restart the pc, turn it back on, unplugging and plugging again, updating Geforce Experience Drivers…

Any help is considered…
Also, if I wrote anything wrong, please forgive me, I’m spanish and I try my best to make you understand what I’m saying

Thank you all!