...unsolicited oplock break...

[michaelis]

Hallo,
 
i can't find a solution to the following problem. Samba works fine as a
fileserver but sometimes, mostly when transfering large files (> 1Mb) 
it transfers the complete file (both directions, to and from the
samba-server) and then it hangs for some seconds then comes an NT-Error
(an unknown network-error occured. session closed). Checking the
samba-side-log-file brings: unsolicited oplock break by PID and the
complete, uncorrupted, transfered file is in the list of locked files.
What is wrong in that case and what can i do against this.

Greetings, kuMichaelis.