Mine Delfina DSP Lite creases too...
Unfortunately this is confirmed by most of the users.
And there is no way to improve as the problem is that DSP installed on the board is too weak to decode mp3 stream; DSP usage is bouncing 100% and it's easy to crash any time.
There are few ways to live with this:
1) decode mp3 by software way by main CPU (
060@60MHz or any PPC)
2) use clockport on Deneb with some nice clockport music card
3)
use cheap USB sound card with DENEB! Cheap, reliable, no issues.