[Samba] time sensitive error "the specified network name is no longer available."

[William Marshall]

I have a user w/ puzzling error. We have not been able to get a tcpdump or 
significant samba log, but I'm posting to see if anyone else has seen 
this. I did find some older posts that point to possible
client issues.

We're running samba 3.0.25b on RHEL4.

The user reports:
I am getting an error whenever I want to make a copy of a MS Excel file on 
my shared network drive: 

(From windows explorer) I was trying to create a copy, and when I do the 
paste I get the error.
Cannot copy _filename_: The specified network name is no longer 
available."

And then the file that is created is corrupt. The original file is about 
240K.

Now for the timing part. If she executes the copy command, and waits 
(count 1,2,3,4 seconds) then it seems like it works.

Thanks,
Bill Marshall