I got my self a new Project S Series USB Box from amazon (http://www.amazon.co.uk/Projec…..+Box+Black)

lsusb:
Bus 001 Device 005: ID 08bb:2702 Texas Instruments Japan Speakers

I get sound but not for long, after some minutes it switches to white noise.

I wonder did some one maybe find a solution for this already?
It happens via Airplay and MPD. I tried with direct connection to the Pi and with a connection to a powerd usb hub.