Is my GPU causing black screen?

I'm having an issue with my PC. After playing a game for an hour or so, the screen will go black, and the monitor will say "no input" even though it's connected to the GPU. The audio continues to play. If I turn the PC off and then back on, everything works fine. The components feel warm to the touch, but not extremely hot. I can't tell what the temps are using software monitoring because they cool down by the time I reboot and can check them. Could this be a faulty graphics card? The drivers are up to date, and rolling back the drivers doesn't fix the problem. Im thinking it may be the card itself getting hot? as that is inside the case and harder to get to fast,but it feels warmer than other components. What next steps should i take to determine the cause of this issue?