Quote:Microsoft has acknowledged another problem in Windows 10 version 1903 where user's are reporting that their network adapters suddenly stop working after installing a cumulative update.
In the Windows 10 Health Dashboard, 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.

"Microsoft and NEC have found incompatibility issues with Intel Centrino 6205/6235 and Broadcom 802.11ac Wi-Fi cards when running Windows 10, version 1903 on specific models of NEC devices. If these devices are updated to Windows 10, version 1903, they will no longer be able to use any Wi-Fi connections. The Wi-Fi driver may have a yellow exclamation point in device manager. The task tray icon for networking may show the icon for no internet and Network & Internet settings may not show any Wi-Fi networks."

Microsoft has not indicated what cumulative update is causing this issue, but as found by WindowsLatest, users have reported [1. 2] that their WiFi adapters started showing that they were not connected after installing the Windows 10 KB4515384 cumulative update.