KepserverEX - OPC UA / DA stability issues

Hi, 

I have a customer that is using Kepware Server for OPC DA / OPC UA / OPC DA communication between two systems. 
At the moment we are having issues with certain slow updating tags (booleans and integers) that freezes and are not updated between the two systems. 
Continuous updating values are no issue... 

The issue seem to be that the tags gets timed out and are not correctly mirrored between the systems. 

If we create local subscriptions on the KepServer node on the actual tags the error seem to disappear. 

Is there a way to configure kepware to establish the subscription to the source tags regardless of the client status? 
We cant find any correlating error messages in kepware.