Topic: On a Macbook pro 10.5.8, buzzes and bitcrushes with my fireface 800

Hi there,
my fireface 800 buzzes and bitcrushes or suddenly becomes quiet while being related to my Macbook pro 10.5.8 through firewire 800.
I upgraded de latest drivers (version 2.93 and firmware revision 1.70 and 2.77) which I hadn't done yet, but when my fireface runs after one hour, I get some numeric distortion even if I just listen to I-tunes stuffs. I spent yesterday afternoon trying to solve this out but without results, could you help me?
Thank you

Re: On a Macbook pro 10.5.8, buzzes and bitcrushes with my fireface 800

Just tryed again with through a firewire 400 and it seems to work, but I never had this problem before using a firewire 800, and the one I am using now is brand new...