This bug is also related to pulseaudio. You can demonstrate this by
killing pulseaudio, which makes all applications that use sound work
normal again. It's quite sad to see no progress on making pulseaudio
handle this kind of situations. See somehow related bugs #226692,
#230837.
Next time you encounter the bug try following:
$ pidof pulseaudio
6163
$ kill -9 6163
...and to restart pulseaudio type Alt+F2 ... pulseudio
It's an ugly workaround, but it works at least for me.
** Also affects: pulseaudio
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/162701
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