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Prodesk dual monitor issue - monitors go dark and back randomly

HP Recommended
Prodesk G4 400 I7 8700t
Microsoft Windows 10 (64-bit)

Hello. I have bought this refurbished computer some weeks ago, and everything worked fine so far.

But now, without reason, one of the two monitors I have connected suddenly goes black and back in a matter of 2 seconds, like if they were restarting.

It might happen when I am moving one window from one monitor to the other, sometimes even without touching anything.

My main monitor is connected thru HDMI (using a Display Port-to-HDMI adapter), the other thru VGA-VGA.

It's happening sometimes every 20' or so, sometimes just a couple of times per day.

The fan of the Prodesk is not busy, so it's not about overheating. The system has 32GB of RAM, so I assume it's not a memory issue (unless it is the graphic card memory, if is has any).

I've googled around but couldn't find any similar case.

Any help will be gladly welcome.



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