[problem solved?]

maybe not but i have strong feelings that the issue is linked to sociality running in background.

if i activate "keep running in background" in sociality, i can notice pulseaudio stuck after a call, but if i deactivate that option, no issue after several calls

when sociality is running in background, you can see /usr/bin/sociality running via top in xterm or conky

having sociality running in background also generate issue with audio volume: for example if you have audio volume at medium level, after receiving a notification from sociality running in background (with the iphone-like sound), the audio volume automatically increase to high level (even if you are using earphones, that is bad)

somebody can confirm?