samba - Sep 2005 - Slow shutdowns and tmp files?[VASCL:A1037FCE7F5]

I am having problems with long shutdown periods. The machines are 
building  large tmp files, like prf2E6.tmp.  These files are over 1 
gig.  I am running Windows 2000 and Windows XP clients to a Redhat ES 
4.0 with Samba 3.0.14. I have a domain setup. In each of these machines 
there are large amounts of files in My Documents.  When I end up with 
these tmp files, the clients build temp profiles.  How can this be avoided.