Microsoft has acknowledged another problem in Windows 10 version 1903 where users are reporting that their network adapters suddenly stop working after installing a cumulative update. Microsoft has stated that some Intel and Broadcom Wi-Fi adapters are having a compatibility issues with NEC computers and will cause the adapter to no longer work. Users have reported that their WiFi adapters started showing that they were not connected after installing the Windows 10 KB4515384 cumulative update. Some users are exhibiting these issues on their LAN adapters and not just wireless adapters.
Source: https://www.bleepingcomputer.com/news/microsoft/windows-10-1903-is-now-having-problems-with-network-adapters/