Microsoft has addressed a known issue causing Windows 10 20H2 devices to force restart due to the Local Security Authority Subsystem Service (LSASS) system process crashing. The known issue affects both client and server Windows devices where local built-in accounts such as Guest or Administrator have been renamed. Microsoft has also resolved a second issue causing crashes with blue screens on Windows 10 2004 or 20H 2 devices when users plugged in a Thunderbolt NVMe (Non-Volatile Memory Express) Solid State Drive (SSD)
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-fixes-windows-10-crash-issue-causing-forced-reboots/