Microsoft is investigating a bug which will prevent Windows 10 devices using MIT Kerberos realms to start-up or may cause them to enter a restart loop after installing a recent cumulative update. Microsoft is working on a resolution for this newly acknowledged issue with an estimated solution to be available during mid-August. Microsoft also added a new compatibility hold on Windows 10. preventing them from upgrading to Windows 10 1903 if using older Intel Rapid Storage Technology (Intel RST) drivers. The new safeguard has been put in place to prevent users of incompatible devices from experiencing performance issues after installing the Windows 10 May 2019 Feature Update.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-devices-using-kerberos-realms-will-fail-to-start-up/