Problem with ID Safe Automatic Backups has returned

My ID Safe Vault is set with the automatic backup feature "ON".  These backups were created every day by NS.  But after 05-13-2015, the automatic backup stopped.  This same problem happened a few months ago and then for some unknown reason, NS suddenly began creating the backups again.  I have never changed my ID Safe settings.  The automatic backup feature has always been “ON”.  Until this is resolved, I can do the backups manually, but I don’t understand why this problem happens at all.