Static on one channel after playing for a long while (hours or days)

```
What steps will reproduce the problem?
1. Play music, local or Spotify (could take days or a few hours)

What is the expected output? What do you see instead?
Expected: No static is expected, no matter how long music has been playing.
What is seen: On one channel (random between each run) there is suddenly static
mixed in with the music. The static stops when the music is stopped, but starts
as soon as the music starts. Changing song, switching between Spotify and local
music has no effect. If squeezelite is restarted by:
service squeezelite restart
then the static dissappears.

What version of the product are you using? On what operating system?
Running Squeezeplug v7.02, Squeezelite v1.5

Please provide any additional information below.
An external DAC is used, Behringer UCA202. This is the /etc/default/squeezelite
file in short:
SLOPTIONS="-n Kitchen -f /var/log/squeezelite.log -o plughw:CARD=CODEC -a :::0"
SBSHOST=""
SLMAC="raspberry-mac-here"

Not a single word in the log, unfortunately.

```

Original issue reported on code.google.com by `adrian.s...@gmail.com` on 27 Feb 2014 at 8:00