Choppy audio trough Airplay

[aitor]

Software
XBian version: 1.0 (knockout) (Kernel Linux 3.18.8+)
XBMC version: Not shown in information tab of GUI. Installed from latest, at march 6, 2015.
Overclock settings: default
Installed: Couchpotato, Sickbeard, Transmission.
Airplay enabled.

Hardware
RPi model: B 512
SD card size and make/type: 8Gb
Network: Wireless
Connected devices: TV, USB HD.

Problem description:
I'm trying to send audio to Kodi from iTunes in another computer, but only choppy audio is played. This feature worked well until last Kodi update. So, is a software problem. But I'm not sure if it is a wifi problem or another kind of problem.

What tests can I do to know where is the error?

[f1vefour]

./kodi/temp/kodi.log and dmesg