SharePoint 2013 Backup Hang on "APPLICATION:Microsoft Office SharePoint Services" save set

Hello,

We have a SharePoint farm with 2 Nodes, one WFE and one SQL Server to host the Databases.

Networker Server version is  8.2.3.1 Build 1109 and NMM clients 8.2.3.

The Backup complete on the save sets regarding the Databases, except "APPLICATION: Microsoft Office SharePoint Services". The Jobs status is running and there is not any save session active.

We left the job to run for 12 hours without any progress until we force stop it. If we set "Inactivity timeout" on the Group the backup fail with error "82867:nsrsnap_vss_save:Stopping an instance of NMM save with process Id=36408 on host: . There is another instance of NMM save program is already running" after the inactivity timeout reached.

Same error occurred even if we stop the previous nsrsnap_vss_save process.

Thanks
.