My sound card supports surround and I've noticed that if I switch the
output to that and back to stereo, the problem disappears for a while
(making me think it's a buffer issue). It also works with switching to
the sound card's digital output, but causes an audible pause in sound.

To do this for me when the sound starts crackling, I've added a launcher to 
Unity that simply has this as its Exec line:
sh -c "pactl set-card-profile 'alsa_card.pci-0000_00_14.2' 
'output:analog-surround-40' ; pactl set-card-profile 
'alsa_card.pci-0000_00_14.2' 'output:analog-stereo'"

This of course only works on my computer due to the PCI address, but the
concept should work in general.

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https://bugs.launchpad.net/bugs/444950

Title:
  sound stops working with pulseaudio

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