Zarn - 2004-10-08

Hi, Ive installed the a920 version on my phone but it stutters, Ive shut down gps and bluetooth and any un-needed progs, rebooted after install.
Ive tried file bit rates down to 64kbps 44.1 stereo.
I have firmware version 21.58.01 (UK)
Any ideas?
thanks
j