I don't expect it to be the cause, but who knows: does your GPU happen to be sitted in the bottom-most PCIe slot of the motherboard ? I encountered weird stuff

I don't expect it to be the cause, but who knows: does your GPU happen to be sitted in the bottom-most PCIe slot of the motherboard ? I encountered weird stuff with the PCIe lines connected to the motherboard chipset (instead of those connected directly to the CPU) on several B550. Some PCIe packets would apparently be garbled/lost when under load, resulting in the driver for the associated peripheral timing out.