File copying over the network - bangwidth periods

Hi folks! I need help!!!
I copy files (5-10 Gb) by xcopy and robocopy from different Windows servers (2003 - 2008 - 2008r2) to windows share and facing 2 problems:
- after the copy is done - the file is deleted on share! o_O I thought that because after copy I unmount share by "net use ... /delete" in a batchfile. I added timeout 3 min., but the file is deleted before the share is unmounted (as i see in security
audit - deletion by user who copied file). and my second assumption links to second question
- I trace the network utilisation during the copy process and see the following: copy starts at 100% of bandwidth, after after that 2% --> 50%(average - from 0 to 100 very fast) --> 2% --> 100% and so on... the period of changes is about 3
min (sorry, don`t know the amount in bytes).
my assumption is that there is some kind of cache - network or disk - that transfers by portions and when the last portion is transferring - the share unmounts and file deletes (-timeout is unsufficient).
SO please help me understand this network behaviour - looks like it`s a OS feature and can it be the cause of deletion?
Thanks for help!
Stanislav.

Hi Stanislav,
Glad to hear that the issue has been resolved. Would you please share the detailed solution about the issue.
This will help others who are fighting with similar issues.
Regards,
Mandy
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