Note: my computer can run the game very smoothly at top settings, and I have been playing for months

A Few days ago, while playing, my computer screen completely died, yet my computer continued to run. After a couple of seconds I could hear that it had restarted itself.

Puzzled I restarted and everything seemed fine. But once more after 15mins on ff14, it did the same thing. Not wanting to rule out my usage of two monitors, I have tried combinations of programs so see what the trigger is and have also monitored my CPU usage, which at maximum was around 12%

After a couple of days testing back and forth. I've managed to pinpoint that FinalFantasy14 is the reason my computer keeps having this issue, but now im wondering, since it's so close to after the patch, is it software or hardware? Or is it me being unlucky and having logged out at an Uldah inn?