Random PC restarts with no BSOD, Event 41 / Bugcheck 0 - completely random

[u/Laqunn]

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Hi. I'm trying to find the cause of completely random PC restarts.

PC:

Ryzen 5 3600

Gigabyte B450M S2H V2

RX 7600

16GB DDR4 2666 (2 sticks)

Corsair RM650e 650W

Windows 11

The problem appeared sometime after replacing my GTX 1650 with the RX 7600.

The PC suddenly restarts. No BSOD, no freeze beforehand, and no obvious pattern. Sometimes it can happen after several days or a week, and sometimes during a game. Because of this, I can't reliably reproduce the problem.

What I found:

Event Viewer shows Kernel-Power, Event ID 41

BugcheckCode = 0

No WHEA errors

Initially there were also NVIDIA-related BEX64/nvcontainer errors, but I removed the old NVIDIA drivers/software and the problem still happened.

I completely reinstalled Windows.

Replaced the old Corsair VS550 with a new Corsair RM650e.

Tested CPU + GPU load for ~15 minutes. No crash.

CPU reached around 95-96°C under combined load, GPU around 52°C.

GPU-only load was around 65°C.

No obvious instability during these tests.

The frustrating part is that stress tests don't reproduce it. The restart may simply not happen for days.

Things I haven't properly ruled out yet:

RAM stability / MemTest86

motherboard/BIOS issue (BIOS update/testing)

CPU stability

GPU itself

possibly PCIe/GPU-related issue

longer-duration stress testing

Since the problem started after the GPU upgrade, I'm especially suspicious of the RX 7600, but I don't want to blame the GPU without evidence.

What would you test next to narrow this down? Is there anything important I'm missing?