Are oplocks enabled on the share?
You might want to open a tech support (http://www.readynas.com/support
) case. Edit the thread title (i.e. subject of first post in the thread) to include your case number.
4.1.9 and later does include a major samba update. I would avoid 4.1.9 due to the known issue with 4.1.9, but if you are willing to try 4.1.10 beta you might find that worth a try to see if that helps.