Check that the GPU is firmly installed and the power cables are fixed and connected.
- Check with software for the GPU's heat before the crash.

And look for the crash report to see what exactly caused the crash.
- Video card shut down can be a few different items, game code, game engine issue, power short, unstable card seating during high fan speeds or vibration, overheating, and still more.

If you do check the card seating, ensure that the PC is off, disconnect the PSU cable and try the start button to drain the residual power from the system.
- Then unlatch the Video card lift and check the port for clean and unobstructed card entry.
- re-seat the card and latch.
- Check the power connectors for any arcing or burn marks. (not all cables are well made)
(both the cable connector and the card connector)

Note: look at the card fan (s), clean? Heat sink(s) clean? And were the fans actually working before the card crash?

Having the crash report is your first diagnosis check. (why)