Nautilus filecopy hangs on samba shares

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https://bbs.archlinux.org – If I take nautilus and browse to a samba network share, it mounts fine, using gvfs-smb. When I try to copy a large folder, like 6GB, it starts copying fine but eventually hangs at some point and doesn't continue. Sometimes at 1GB sometimes at 5GB or even at 100MB. No log messages in the journal or dmesg, nothing's crashed. I can even select the folder from the share again and retry copying with the same result as before.If I take a console and change to the smb mount in "/run/user/1000/smb-share...", I can copy the whole folder multiple times without hanging using rsync -Pa (HowTos)