NetBackup Deduplication Multi-Threaded Agent service terminated

Hello everyone,

since updating our NetBackup Agents from 8.0 to 8.1.1 on some SQL Servers we receive the following error message after every single database backup:

First informational messsage (ID 7036):

The NetBackup Deduplication Multi-Threaded Agent service entered the stopped state.

Then the error (ID 7024) occurs:

The NetBackup Deduplication Multi-Threaded Agent service terminated with the following service-specific error:
The operation completed successfully.

Since this isn't happening on all SQL Servers I've reinstalled the Agent on an affected one which didn't solve the issue.

The mtstrmd Log in NetBackup\logs\pdde shows the following error for each error id 7024:

November 21 02:11:33 ERR [000000AB95811BD0]: -1: mtstrmd.exe aborting with error: boost::interprocess::intermodule_singleton initialization failed

Antivirus exclusion for the NBU folders is defined and restore tests have been done -> works without issues!

Do you have any idea what is going on here?

Thanks in advance for your help.