1000mV is low. Try 1150mV with 1800Mhz. 1V may crash.
Such problem is most likely hardware-related. And you've done all test and you know the problem is with the GPU. This problem can also occur in another game. Good luck.
Im so happy now. I changed my Msi gaming x 5700 xt to Asus Rog strix 2070 super. This is flawlessly. Gl all to find solution