Comment 40 for bug 1067434

I really dont want to leave a headphone connected at all times in my desktop computer so I tried more things and this seems to have fixed the issue:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/874535/comments/31

To restart pulseaudio, either reboot your computer or run "pulseaudio -k"

More references:
https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/874535
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1585084
https://askubuntu.com/questions/69001/volume-blinking-up-and-down-rapidly-on-gnome-shell
https://ubuntuforums.org/showthread.php?t=2132324&page=2&s=48b8508c3653cf0dfc724cbd533eba52
https://forums.linuxmint.com/viewtopic.php?t=157635