Networker 8.2 Linux backup failing as file "changed during save"

Folks

We have a backup running on an RHEL7.1 server which consistently fails with the warnings below,

-- Job Indications ---

Unable to close the save session: Authentication error; why = Failed (unspecified error)

Warning: `/opt/sas/config/Lev1/Web/activemq/data/kahadb/db-83.log' changed during save

Warning: `/opt/sas/config/Lev1/WebInfrastructurePlatformDataServer/data/base/16384/18250' changed during save

I'm not sure whether the changed file error is the problem or the authentication error above that, does anyone know what is causing the failure?

Any Help Appreciated

Michael