SOLVED - after a couple of hints with Tanu Kaskinen, this is solved with
the following entry in /etc/pulse/default.pa

.ifexists module-udev-detect.so
load-module module-udev-detect tsched_buffer_size=16384

The suggested cause is that the kernel doesn't allow sufficient time to
process the default 50000 bytes.

The pulseaudio daemon process has been running without error (in 5.1
configuration) for over 5.5 hours.

Is this a hardware issue? Or a kernel parameter issue? or a combination
of the two?

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https://bugs.launchpad.net/bugs/1673942

Title:
  pulseaudio suddenly stops. No dmesg entries. Nothing in the syslog

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