Reset the KDE Plasma Phonon audio cache.
If you computer is failing to connect to your connected loudspeakers or microphone it maybe that resetting your audio cache will correct the problem.
KDE Plasma saves the audio settings here
~/.config/pulse
where ~ signifies your home directory, for example
/home/neil
giving
/home/neil/.config/pulse
In the first instance you may wish to rename this file, better to have a backup in the event of an error.
Within this directory there are entries for the default-sink (for example loudspeaker line out) and default-source (for example microphone)
The directory can be reviewed for the most recent edited files, or all entries ending in default-sink and default-source to be deleted.
