I have the same problem.
I use sox to redirect the audio from mi tv tuner card, using SAA7134 drivers, 
both cpus are under strong charge and periodically the sound skips and I find 
some warning ALSA under-run or ALSA over-run as well.
I do use Pulseaudio.

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Audio has occasional skips/dropouts
https://bugs.launchpad.net/bugs/476702
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