Raspberry Pi: Distorted sound in random intervals for some seconds

```
- What steps will reproduce the problem?
Run multiple instances of squeezelite as a daemon, e.g. with an init.d script:
/usr/bin/squeezelite-armv6hf -o sysdefault:CARD=forRoomX -n RoomX -m
00:00:00:00:00:XX -s 127.0.0.1 -a 80:4:16:0 -f /var/log/squeezeliteX.log -d
all=info
(Replace X with values 1 - 6. Unfortunately, I cannot say if the problem has
anything to do with the multiple instances)

- What is the expected output? What do you see instead?
Expected output is clear sound. But in random intervals, you can hear a
distortion noise (please have a look at the attachment file).
E.g. player 1 is playing an internet radio stream, the other players are
stopped. After e.g. 20 minutes running the noise might appear for approx. 3
minutes. Then everything runs fine for another 30 minutes (or even a day), and
so on.

- What version of the product are you using? On what operating system?
squeezelite-armv6hf binary 1.7 on Raspbian

- Please provide any additional information below.
This issue might be similar to #31, but I am not sure if the authors meant the
same like this one, so I tried to record the distortion from the audio speakers.
(I just saw in your Changelog that v1.8 is the current version. Would you mind
publishing it in binary hf format?)

```

Original issue reported on code.google.com by `i...@schaussi.com` on 17 Jan 2015 at 9:08

Attachments:
- [distorted.mp3](https://storage.googleapis.com/google-code-attachments/squeezelite/issue-88/comment-0/distorted.mp3)