EXS 24 Logic Sampler Users Group

i just installed exs24
when i test the included samples
its fine for about 5 minutes then crazy random pitch and length, then 
back to normal for few minutes, then back to crazy.

every time i quit and open logic again it starts out okay.
I'm not even talking about recorded stuff.
Just playing live.

my midi goes to the digi001.
i use logic 4.7.2, OS 9.0.4, g4 450 640ram

i read the previous post about "haywire and hanging notes" blamed on 
new unified engine, I turned it off and doesn't help.

any suggestions on what's the problem and what I can do?

Hiro No