I wonder if this has something to do with it - at the start of the log:

(  79.528|   0.000) I: [pulseaudio] resampler.c: Using resampler 'speex-float-1'
(  79.528|   0.000) I: [pulseaudio] resampler.c: Using float32le as working 
format.
(  79.528|   0.000) I: [pulseaudio] resampler.c: Choosing speex quality setting 
1.
(  79.529|   0.000) D: [pulseaudio] memblockq.c: memblockq requested: 
maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0
(  79.529|   0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: 
maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0
(  79.529|   0.000) I: [pulseaudio] sink-input.c: Created input 0 "pulsesink 
probe" on 
alsa_output.usb-Logitech_Logitech_USB_Headset-00-Headset.analog-stereo with 
sample spec float32le 2ch 48000Hz and channel map front-left,front-right

At the end of the log:

(3974.064|   0.000) I: [pulseaudio] resampler.c: Forcing resampler 'copy', 
because of fixed, identical sample rates.
(3974.064|   0.000) I: [pulseaudio] resampler.c: Using resampler 'copy'
(3974.064|   0.000) I: [pulseaudio] resampler.c: Using float32le as working 
format.
(3974.064|   0.000) D: [pulseaudio] memblockq.c: memblockq requested: 
maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0
(3974.064|   0.000) D: [pulseaudio] memblockq.c: memblockq sanitized: 
maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0
(3974.064|   0.000) I: [pulseaudio] sink-input.c: Created input 66 "Playback 
Stream" on 
alsa_output.usb-Logitech_Logitech_USB_Headset-00-Headset.analog-stereo with 
sample spec float32le 2ch 44100Hz and channel map front-left,front-right

As you can see, the resampler changes. Could this cause the low quality
audio?

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https://bugs.launchpad.net/bugs/985989

Title:
  audio crackling after playing for several minutes

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