RN214 Failing to Update Antivirus

Hi,

For the past week I have been getting a daily alert "System: Antivirus scanner definition file update failed due to download failure. Check your Internet connection."

I have found a number of old posts on this subject where the solution has been to modify a setting, or to update ReadyNASOS. However I do not think that either of these solutions are appropriate for me:

1.) My ReadyNAS 214 is on OS v6.10.3, which is the latest that I can find. (It was updated almost as soon as this version was released).

2.) Each failure triggers an alert email, which is correctly sent. So the internet connection must be OK?

3.) SSH into the ReadyNAS and running "freshclam" as root always updates the AV and this is shown as having been updated on the ReadyNAS System Overview page and system log. So again, it must be connecting to the internet properly?

I have also seen suggestions to reboot the ReadyNAS,which I have done a few times, but this did not help. Whilst I can update the AV manually, it is becoming rather laborious - and should be automatic.

Does anyone have any other suggestions please?

Paul