Comment 1 for bug 1827181

March 2019 may mean the problem started with the released of:

  https://launchpad.net/ubuntu/+source/pulseaudio/1:11.1-1ubuntu7.2

But maybe not. Some other package (like the kernel) might also have changed around then. To test this theory, please try installing the previous version *.deb files from:

  https://launchpad.net/ubuntu/+source/pulseaudio/1:11.1-1ubuntu7.1/+build/14932424

You only need the .deb files and not the .ddeb files. And even then you only need to replace the ones already installed. To get a list of packages you need, just run:

  dpkg -l | grep 11.1-1ubuntu7.2 | awk '{print $2;}'