Samba problems with large files

Hi, I'm experiencing a strange problem. I have installed SuSE 7.0 on an ASUS CuBX MB with a celeron 600, and use samba and ISC dhcpd. Everything works fine, except when I try to copy large (>100MB) files. I copied a ghost image to the SuSE box without problem (almost 500 MB). However, when I try to copy it from the SuSE box to another machine, SuSE totally freezes. Copying smaller (~10MB) files is no problem. I have all but ruled out a hardware conflict, so I'm running out of options. Has anyone on this list experienced a similar problem? TIA Stefan