I don't know if this will help at all but this is what cat /var/log/syslog | grep pulseaudio outputs (special lines marked with => and explained below):

=> May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: snd_pcm_delay() devolvió un valor que es excepcionalmente grande: 384788 bytes (2181 ms).
=> May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: Lo más probable es que sea un error del controlador ALSA «snd_cmipci». Por favor, informe esto a los desarrolladores de ALSA.
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: snd_pcm_dump():
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: Hooks PCM
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: Its setup is:
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   stream       : PLAYBACK
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   access       : MMAP_INTERLEAVED
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   format       : S16_LE
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   subformat    : STD
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   channels     : 2
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   rate         : 44100
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   exact rate   : 44100 (44100/1)
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   msbits       : 16
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   buffer_size  : 16384
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_size  : 8192
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_time  : 185759
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   tstamp_mode  : ENABLE
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_step  : 1
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   avail_min    : 15503
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_event : 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   start_threshold  : -1
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   stop_threshold   : 1073741824
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   silence_threshold: 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   silence_size : 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   boundary     : 1073741824
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: Slave: Hardware PCM card 0 'C-Media CMI8738' device 2 subdevice 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: Its setup is:
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   stream       : PLAYBACK
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   access       : MMAP_INTERLEAVED
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   format       : S16_LE
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   subformat    : STD
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   channels     : 2
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   rate         : 44100
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   exact rate   : 44100 (44100/1)
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   msbits       : 16
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   buffer_size  : 16384
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_size  : 8192
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_time  : 185759
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   tstamp_mode  : ENABLE
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_step  : 1
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   avail_min    : 15503
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   period_event : 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   start_threshold  : -1
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   stop_threshold   : 1073741824
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   silence_threshold: 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   silence_size : 0
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   boundary     : 1073741824
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   appl_ptr     : 4457581
May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c:   hw_ptr       : 4361384


=> May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: snd_pcm_delay() devolvió un valor que es excepcionalmente grande: 384788 bytes (2181 ms).

This one means that snd_pcm_delay() returned an exceptionally big value: 384788 bytes (2181 ms).

=> May  7 17:50:15 deepblue pulseaudio[9676]: alsa-util.c: Lo más probable es que sea un error del controlador ALSA «snd_cmipci». Por favor, informe esto a los desarrolladores de ALSA.

And this one means that probably this is an ALSA «snd_cmipci» driver error. Last sentence is "report ALSA developers".