Comment 13 for bug 451841

I experience the same problem (I think). I try copying files from a nautilus SMB share to a nautilus FTP share, and I usually cannot go further than about 500MB (because the SMB share fails, not the FTP)
I try reading musing from the SMB share, sometimes it will stop playing within a few minutes, sometimes longer.
I also believe that suspending the computer will also create the same problem.

Sometimes I am lucky and Nautilus lets me unmount the SMB share and remount it, but most of the time, I have to kill nautilus, because I get the same error message.

Here is what I get through the command line.
gvfs-mount -u smb://admin@192.168.0.125/video/
Error unmounting mount: DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.