SAMBA copy/move hangs

[Elbarbudo]

I try to move / copy backup files stored on an Iomega personnal NAS.
Sometimes, it works, sometime it hangs but I have no idea of the cause :
- number of files ?
- size of files ?
- other?

I am not sure it's Nautilus, but that was automatically chosed by Apport

I think it's rather a gvfs bug

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: nautilus 1:3.6.3-0ubuntu16
ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
Uname: Linux 3.8.0-29-generic x86_64
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
Date: Wed Sep 4 10:05:57 2013
ExecutablePath: /usr/bin/nautilus
GsettingsChanges: b'org.gnome.nautilus.window-state' b'geometry' b"'735x521+629+209'"
InstallationDate: Installed on 2013-05-09 (117 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)