These messages are very suspicious in your second ~/.xsession-errors
file:

"ALSA lib ../../../src/pcm/pcm_dmix.c:874:(snd_pcm_dmix_open) unable to
open slave".

Could you please try running a normal session from a fresh boot (so you
get fully working sound), and do all of your normal tasks for an hour or
so (including running your normal media application to listen to sound),
and then confirm that your ~/.xsession-errors file for this session does
not contain these errors (or just attach the file here again).

Thank you.

-- 
no sound at all after session stop
https://bugs.launchpad.net/bugs/252899
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