https://wccftech.com/how-to-fix-windows-10-audio-1709-1803-1809/

Windows 10 continues to cause issues for users with its updates. As reported earlier some users were getting the Blue Screen of Death (BSOD) after installing updates on Windows 10 April and October 2018 Update. This wasn’t the only problem as there have been several reports around Task Manager issues and app problems that have been reported since the release of October 2018 Update.

If that wasn’t enough, Patch Tuesday updates brought in their own set of issues for even the older versions of the operating system. Several users reported earlier this week that their machines lost audio after cumulative updates were installed. The problem apparently came from a buggy Intel audio driver that broke the sound on some machines.