HI Folks,
I upgraded to Windows 11 on release day with no issues at all, however; a few days later I noticed VBS was enabled and decided to disable it for a little more performance. After a reboot my system showed all the symptoms that the OP and others have mentioned and the event viewer pointed to iCue crashing and causing the system to become unstable. So I disabled iCue and lo and behold - everything went back to normal, no issues. I have a lot of RGB fans (18), keyboard and 6 lighting strips so I really need iCue (or go back to the dark ages) and the only way to achieve this is to enable VBS and protect the system from the iCue software. Hope this helps.
Hardware specs
Asus ROG Crosshair VIII Hero, Ryzen 9 3900XT, 32GB Corsair Vengeance RGB Pro
Corsair Obsidian 1000D, 2nd Corsiar Commander Pro, Corsair AX1600i PSU
Disk Drives
KINGSTON SH103S3240G (240 GB, SATA-III)
KINGSTON SH103S3240G (240 GB, SATA-III)
NVMe Samsung SSD 950 SCSI Disk Device (476 GB)
Samsung SSD 850 EVO 1TB (1000 GB, SATA-III)
WDS100T1X0E-00AFY0 (1000 GB, PCI-E 4.0 x4)
WDS200T1X0E-00AFY0 (2000 GB, PCI-E 4.0 x4)
KINGSTON SH103S3120G (120 GB, SATA-III)
GPU
Nvidia 1080ti