Nobody suggested to Dr it because that won't fix it.
What you will find if you search on this topic is the suggested workaround fix, which is
to start playing a YouTube vid, and then hit the power/sleep button to shut it off.
It'll continue playing for a few seconds after the screen goes black, and then
quit. When you wake it up, many people report the sound is back to normal.
May take a couple times, but is faster than restarting.
The other more consistent fix is to stop and start audiod, but requires
command line access (wTerm rocks for this). Someone said they
added this functionality to PulseAudio restarter app, but apparently they never
published it to Preware (dunno why not).
Anyway, when I was up to restarting 3-4 times a day on 3.0.4 (before
the workaround were known), I gave up and Dr'd back to 3.0.2 and have been there
ever since. I may stick with 3.0.2 until they fix this bug, as 3.0.5 offers little else that
I care about.