My PC restarts unexpectedly whether I'm gaming or just leaving it idle. I've already updated the BIOS, reinstalled the graphics driver, tried undervolting the GPU, and disabled XMP, but the problem continues. The system has an RX 6700 XT, an Intel Core i5-12400F, and a 750W Antec power supply. What else should I check?
2 Answers
What temperatures are you seeing when the restarts happen? High CPU or GPU temperatures could cause instability, although temperatures below roughly 76–77°C would generally look normal.
How old is the power supply? Even with a 750W unit, a faulty or unstable PSU can cause sudden restarts without showing a blue screen.
The power supply is only around three to four months old.

The temperatures seem normal and stay under about 76–77°C.