ownCloud Mac Client made SMB server crash

I have a folder in a usb drive connected to a Mac on OS X 10.11.6 shared by Samba to PC users
This folder is monitored by an ownCloud client on this mac
after few minutes, owncloud freeze for a good moment and smb daemon stop responding
i thought it was a maximum user connected or some user permissions, ...

the ownCloud client logs looks normal without error
same for the ownCloud server no error
but my server shows this :

smbd[]: query_directory error<0xc000000f>

This might not be related to ownCloud.

https://forums.macrumors.com/threads/osx-10-11-1-file-server-smb-shares-to-windows-7-users-using-ad-vmware-machine.1940460/ describes a similar problem.

Regarding ownCloud behaviour, according to https://msdn.microsoft.com/en-us/library/ee441884.aspx the "0xC000000F" error code matches a "file not found" in the SMB server. I guess ownCloud just waits for the SMB server to respond, but gets that error and acts as if the file isn't found (which is what that error tells).

Without more data I'd blame the SMB server.

Yes i read this thread.. but not my issue, because, it's happening only if the owncloud client is running on the mac samba server.

and owncloud client is not connected to samba, but directly to the drive on the mac