Tech support

OT: need technical support (Windows 11)

My work computer is having issues and my company doesn’t have a real tech support team (small company, my bosses have to take it to Best Buy/Geek Squad and see what they say) so I was hoping maybe someone here who is smarter than me can help me figure out what my problem is

Lately I’ll be in the middle of something and everything will work just fine, until it doesn’t. Everything will lock up and after a few seconds I will get a prompt saying “Microsoft Windows: This application is not responding. The program may respond again if you wait. Do you want to end this process?” Waiting does nothing and terminating closes everything and gives me a blank screen. If I just press the power button and put it to sleep, not even a full shutdown, it will start working again for a little while. It’s gotten to the point where it happens multiple times a day now, including once while typing this message.

I ran Windows troubleshooting wizards, malware scanner, defragmenter, updated drivers, performance scans, etc. and everything seems to be fine. I don’t get any errors, corrupted files or anything else. Does anyone have any idea what could be causing this? My first thought is maybe a hardware problem or a failure?