Not optimized Address block error with S7 1500

Hello, I had this error in Ignition (see the attached picture)

This error occurs very rarely but when it starts a gateway reboot is necessary. There are 4 connections to Siemens S71500 and one S7 300, here below the models

CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.5
CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.1
CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.5
CPU 1515F-2 PN 6ES7 515-2FM01-0AB0 Firmware v2.5
S7-300

The ignition version is 7.9.8 (b2018060714), installed on a Windows Server 2016 Essential version 1607, build 14393.2999. The JVM is a JDK 1.8 update 181.

Can you please tell me how I can avoid this happening ?

Regards

Hi Cristiano, Do you resolve your problem? I have the same error with a S7400 PLC.