[Samba] Problems deleting files from Server

[SW Kisters]

Dear Sirs,
 
We are running a Linux server with Samba and windows-pc's
When connecting a laptop through a mobile phone (via a router) and
sending small datafiles 
to the server we get an error when we want to delete these files of the
server
the server comes with the error 'still in use', but I'am sure it isn't.
Also when the connection is finished
I can't delete the files. However when we wait for appr. half an hour we
can delete these files
 
Can you help me out?
 
Thank you in advance
Bas Kisters
swkisters at home.nl
 
 
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