I can see a few audio-related error messages in your kernel log. But even if that wasn't true then I would still suggest this is most likely a kernel bug.
In case the problem happens to be pulseaudio crashing, please follow these instructions first:
If you couldn't find any evidence of 'pulseaudio' crashing in the past then please try some slightly older (or newer) kernels and tell us if you find some that don't have the bug:
I can see a few audio-related error messages in your kernel log. But even if that wasn't true then I would still suggest this is most likely a kernel bug.
In case the problem happens to be pulseaudio crashing, please follow these instructions first:
https:/ /wiki.ubuntu. com/Bugs/ Responses# Missing_ a_crash_ report_ or_having_ a_.crash_ attachment
If you couldn't find any evidence of 'pulseaudio' crashing in the past then please try some slightly older (or newer) kernels and tell us if you find some that don't have the bug:
https:/ /kernel. ubuntu. com/~kernel- ppa/mainline/ ?C=N;O= D