Note to any future lemmings who find this thread troubleshooting the same symptom…
Rule out unswitched (non-chipset, direct CPU lanes) PCI connectivity and power issues by testing without specific PCI components. Unstable PCI errors can be missed during post and present later after boot, and Windows is especially bad at handling it transparently. Common culprits include GPU sag, dubious riser extensions, and anemic PSUs
If there is a “high bandwidth” feature toggle for RAM in your BIOS settings that is currently on, try turning it off
If your system drive is an NVMe blade with a Phizon controller, check if the manufacturer software has a firmware update available.
If the freeze is regular but not persistent, try turning the polling rate down on your mouse, and if it’s wired, try to make sure it’s plugged into one of the board’s SOC-hosted USB 2.0 ports
Note to any future lemmings who find this thread troubleshooting the same symptom…