Sounds like a weak power supply, or driver issue, as well as Windows bugs.
Suggestions:
1. Start with checking for a BIOS update from the manufacturer of the motherboard/PC.
2. Check for device driver updates -
Intel has a utility that will check for that sort of thing:
Intel® Driver & Support Assistant
If it's an AMD based machine, they have one too:
https://www.amd.com/en/support
Nvidia has something called GForce experience that can check the video card drivers if it is an nvidia card.
I don't have a handy link.
3. Run Windows Memory Diagnostic, or Memtest86 to test your system RAM.
4. Check the Windows OS for corruption:
Open a Command Prompt with Run As Administrator.
SFC /scannow
That will check for system corruption and fix files.
5. There is another windows utility called DISM. You'll need to google that - a bit too involved for me to give you a quick command line.
6. Run Windows Update multiple times. Reboot after it installs any updates.
There was an issue with windows not resuming video from standby properly, and they fixed that as far as I know.
7. If the PC power supply is more than 5 years old, it might be starting to fail. That's usually a worthwhile next step for a replacement, as they are a lot cheaper than video cards.
Good luck.
Colin