Windows 10 keeps forgetting ReadyNas

I run two RNAS 104's and both have a similar problem to that described and have done for 2+ years.  Both NAS are running with OS 6.6.0 (current) and both loaded with 4 disks configured as Raid 5 and no optional apps other than SMB Plus (1.0.4)

The effect is that when doing a backup by file copy (5,000+ files, big and small) Windows 10 Explorer hangs and eventually indicates that it has lost the connection to the RNAS.  Trying again usually kicks the copy off again, but it can need that every 5 minutes or so (which is kind of irritating in a 2-3 hour copy process).

Some time ago (I forget the details) an OS patch was published to deal with this and it worked, but the issue returned with subsequent OS updates.

However, turn off real time antivirus scanning on the NAS and all is resolved.  I don't like it as a solution and all I can deduce is that the AV process is causing a timeout on the Windows copy.

I then updated SMB PLus to the current version (1.0.5) and restarted the real time AV scanning.  All now seemed well.

So to anyone with a Windows connect problem I'd say make sure you are up date (main firmware and apps), usually sensible anyway, and if that doesn't fix it try disabling the real time anti-virus scanning.