I don't see PC details so I'll ask for that now. Be sure your back copies are current as we start checking into what it could be. So for now, tell the forum the following things.

1. Make, model, age of the PC.
2. If you do your regular maintenance or have it done (canned air to vents, how often?)
3. And to give a peek under the hood, a Web Speccy report.
How is at https://www.piriform.com/docs/speccy/using-speccy/publishing-a-speccy-profile-to-the-web