it is a power issue .
idk but when you login into bios verify the voltage (bottom right) in bios if the bios supports
View attachment 148678
check if the voltages are within the 5% .Generally in asus these readings are in realtime and if they are critically low the text is in red. Most probably connection might be loose or smps is genuinely bad.
Another observation would be supposedly your + 12 + 5 +3.3 remain below the actual value lets say may be 11.8 4.8 2.8 and remains constant for 10 - 5 minutes that to indicates your psu is bad . your system will boot but the voltages might drop causing your internal device to fail.
If all your voltages are as per spec there is a good chance that your CPU Power Cable (EPS12v) and GPU power cable are sharing the power rails and that rail might not be able to handle the combined load when your system is under load
Try to connect gpu cable to different port (different rail) and do the stability test. things would be good.