Checking your computer’s Event Viewer (eventvwr.msc) may offer clues. In the Event Viewer window, go to the upper left-hand corner and double-click “Custom Views”. Then click “Administrative Events”. Scroll through the entries that appear to find any that might be related to your graphics card.
In some situations, an outdated BIOS could be causing a specific issue with a device that's making it report an issue to Windows, so updating your BIOS/UEFI may help.
You may have to replace your graphics card, but before you do, try re-seating it in its slot to see if that helps before you spend any money.