Trying to diagnose of crashing to see if it’s software or hardware

I’m looking for some help diagnosing a recurring issue with my PC. Below are the specifications and a summary of the problem and troubleshooting I’ve carried out so far. PC specifications: - CPU: AMD Ryzen 7 9800X3D - GPU: ASUS PRIME Radeon RX 9070 XT OC - Motherboard: MSI MAG B850 Tomahawk MAX WiFi - RAM: 32GB Corsair Vengeance DDR5-6000 - Storage: WD Black SN7100 1TB NVMe - PSU: ROG Strix 1000W Platinum - CPU cooler: Corsair Nautilus 360 RS AIO - Case: Corsair AIR5400 - Monitor: Samsung Odyssey G7 - Operating system: Windows 11 Description of the problem: - The PC occasionally completely locks up while gaming. - The most common symptom is the screen going completely white, sometimes accompanied by audio stuttering/freezing. - The PC becomes completely unresponsive and requires holding the power button to shut it down. - There is no BSOD or normal Windows crash screen. - It has happened across multiple games, including War Dogs, Hunt: Showdown and Overwatch 2. - Some games, such as Farming Simulator, have not reproduced the problem. - The crashes generally happen after the PC has been running/gameplay has been going for some time rather than immediately. - I have noticed a possible correlation with audio/microphone use. On some occasions the crash has occurred while using my HyperX USB headset/microphone. - There may also be a possible connection with Discord, particularly using voice chat or the Discord overlay, although I have also had crashes without Discord running. Troubleshooting already carried out: - Performed a clean reinstall of Windows 11. - Reinstalled the AMD chipset drivers. - Clean-installed the AMD Adrenalin GPU drivers. - Used DDU to remove/reinstall display drivers. - Updated the motherboard BIOS to the latest version. - Tested with EXPO disabled. - Previously tested with EXPO enabled, but have since disabled it to eliminate RAM overclocking as a possible cause. - Reseated the GPU. - Disconnected and reconnected the GPU PCIe power cables. - Checked/reseated relevant hardware connections. - Ran Windows Memory Diagnostic. - Ran OCCT stress tests. - Ran GPU stress testing through AMD Adrenalin. - Temperatures appear normal under stress testing. - The PC has passed the stress tests without reproducing the crash. - I have also verified the integrity of affected games through Steam. Windows/Event Viewer findings: - After the forced shutdown, I generally see Kernel-Power Event ID 41, which appears to be a result of the system being forcibly powered off rather than the original cause. - I have not found a clear error immediately preceding the crashes. - Reliability Monitor has not provided a useful crash entry. - I have also seen some HAL/IOMMU-related informational events, but nothing that has clearly identified the cause. At this point I’m trying to determine whether this is more likely to be a hardware issue (motherboard, GPU, RAM, USB/audio subsystem, etc.) or a software/driver issue, particularly involving USB audio, Discord, overlays or GPU drivers. The fact that the system can pass stress testing without crashing but can hard-lock during normal gaming has made it particularly difficult to isolate. Any advice on what you would investigate next would be greatly appreciated.