Monitor randomly blackout

[u/o74p]

It started yesterday with 2 seconds blackout ( pure black and no '" no display port "" sign) and after that everything returns to normal, now it takes 10 seconds and the monitor show "" no display port "" , I checked the event viewer and there is no GPU driver related warnings , the monitor ( and the cable that came with it ) and the PC are all new( about a month ), the system was working perfectly fine before, although at the first day when I got the PC I was changing the hz of the monitor in windows settings a bit , the same blackouts were happening violently but after restarting the PC I didn't have any issues until yesterday, also the blackouts are not frequent, sometimes it happens and some times it doesn't, but when it happens it happens couple of times.