sound problem on Kubuntu 18.04

Since moving to Kubuntu (almost a year ago), at random times there is
no sound. It can happen a few times a day or sometimes only after a
few days. I discovered that each time this happens, the PulseAudio
profile has changed. 

My solution is an icon on the desktop that runs: 
  pactl set-card-profile 1 output:analog-stereo+input:analog-stereo

But, although I have a solution, I have no idea WHY this is happening. 



-- 
Shlomo Solomon
http://the-solomons.net
Claws Mail 3.16.0 - Kubuntu 18.04

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