final configuration brings down eth0

For some reason my eth0 is being brought down at the end of configuration during the execution of /usr/lib/YaST2/bin/YaST2. Before that script has run eth0 is up, and afterwards it is down. I have taken all network configuration out of my xml control file, and no ifcfg-eth file appears in my /etc/ sysconfig/network directory so I don't know why it stops working. After rebooting eth0 works fine as our kernel looks after eth0 itself. thanks for you help, brian