Sounds like a driver issue to me.
I had strange Windows and BIOS stuttering / lag issues with the 24.x.x driver versions especially in combination with Resizable BAR enabled in BIOS. I ended up installing 23.12.1 and disabling Resizable BAR in BIOS. I've had good stability since (RX6800).
I've seen other reports of users having stability issues with the 24.x.x version of drivers -- some people think it's related to the new frame generation feature introducing new bugs.
If you're not aware, it's recommended you uninstall your GPU drivers each time you upgrade/downgrade/reinstall GPU drivers using DDU and/or AMD Cleanup Utility in safe mode.