Comment 12 for bug 1720519

Update: After reinstalling pulseaudio, alsa-base, pulseaudio-module-bluetooth and plasma-pa (for KDE's volume control applet), the problem reappeared. Commenting out "load-module module-switch-on-connect" in /etc/pulse/default.pa (see comment #4) seems to fix the issue permanently; the module still seems to be loaded due to some other means of triggering the load (see output of: pactl list modules).