Microsoft rolling out new cumulative updates for Windows 10 October 2018 Update and April 2018 Update as it prepares to push May 2019 Update to more users. The focus of the latest cumulative update is on adding an option that would allow users to download and install the May 2019 update. The latest update also includes general improvements and fixes. Microsoft announced in a support document that includes an issue that may cause a temporary KRB_AP_ERR_MODIFIED Kerberos sign-in failure in applications and services configured to use a Group Managed Service Account.
Source: https://www.bleepingcomputer.com/news/microsoft/new-cumulative-updates-for-windows-10-1809-and-1803-released/