[Samba] Urgent -Please comment

[Javid Abdul-AJAVID1]

Hi

We are copying large files off of Unix Server on to PC. These file avg size
are 600MB but about 5 to 6 of these files ( image files ) on to PC from Unix
through CDWriter software.
Now these 5 to 6 image files are being copies simultaneusly.
image file storage data is nfs mounted.

PC is 100 FUll duplex
unix side is 100 FUll 
samba server is 100 FUll ( samba is acting like a gateway ), 

samba version 2.2.1  and 2.0.7
some times its very very slow and sometimes its freezes the system

I am not seeing any errors in samba logs and no networkerrors.
could this be anything else?

Is there a limitation of samba for copying files, like am doing around 3 gig
simultaneuly via this single samba server.

thanks in advance