Intermittent error with CFFILE copy

Question

I have a problem that's driving me nuts and I don't see it in
here already (I apologize if it is and I just missed it).
We have ColdFusion 5.0 (yes, I know it's old) and I've been
using it for an in-house billing program. One of the things it does
is use CFFILE to copy a PDF version of the bill to the boss's
machine. This what that part of the code looks like:
<cffile action="COPY"
source="\\testweb\wwwroot\Billing\invoices\#attachment#"
destination="\\Obi-wan\Data\Glenns Code Backup\QB
invoices\#attachment#">
This is an example of what I get:
Error processing CFFILE
Unable to copy file
'\\testweb\wwwroot\Billing\invoices\Emmi_Solutions,_LLC-Mulert-Asthma_Action_Plans-Round_ 1-No_7661.pdf'
to path '\\Obi-wan\Data\Glenns Code Backup\QB
invoices\Emmi_Solutions,_LLC-Mulert-Asthma_Action_Plans-Round_1-No_7661.pdf'.
Error: The system cannot find the file specified. (error 2).
The file has been created. It's THERE. I can open it. And
sometimes this works without an error! Up until today, when we got
this error, I'd reboot the CF server (testweb) and then it would
work. Today, I've rebooted the server several times and it just
won't.
Any ideas?

Answer 1

Below is the Snippet of code.
It never makes it past this first line. It almost seems like
something on IIS5. I creates the file,but stops at 1048 kb. But
this is weird, when the error message appears, the file becomes
7.8m. The entire file is 8megs
<CFFILE ACTION="Upload"
FILEFIELD=#Attributes.SourceField#
DESTINATION="#TargetFile#.tmp"
NAMECONFLICT="MAKEUNIQUE" ATTRIBUTES="Temporary">
<CFSET FileName = CFFile.ClientFile>
<CFSET FileSize = CFFile.FileSize>
<!--- DETERMINE MIME TYPE --->
<CF_MIME EXTENSION=#File.ClientFileExt#
TYPE=#File.ContentType# SUBTYPE=#File.ContentSubType#>
<!--- MOVE IT TO CORRECT LOCATION (REPLACING OLD VERSION,
IF NECESSARY) --->
<CFFILE ACTION="Rename" SOURCE="#TargetFile#.tmp"
DESTINATION="#TargetFile#" ATTRIBUTES="Normal">