Monitor loses signal but PC keeps running

Main specs: Ryzen 5 7600 9070XT 2x16 DDR5 750W PSU 1440p monitor

This began to occur just recently, for almost a year the PC worked absolutely fine. But now, if I play some game for an hour or so the monitor would suddenly turn black and display “No Signal” while PC is still running. The temps are ok, all cables properly seated, I reseted drivers, looked for malwares, cleaned, it would still do that no matter what.

My only explanation left is that my PSU simply cannot deliver enough voltage to power entire thing up. I’ve checked the Event Viewer and its the same event over and over again — kernel power critical, which exactly indicates at the lack of voltage.

But I wanted to hear your solutions as well, since if even the new more powerful PSU which comes soon won’t fix it I wouldn’t know what to do.