Edge reloads tabs

Hello,

Currently we are in the planning of rolling out the new Edge in our company. We are experience

1 major issue which we do not 

If you have openend several tabs in private and normale mode and for some reason tabs are automatically reloading when you click (the just reload after some inactivity) on them. Is that a normal behaviour and how to overcome this ? We couldn't find any solution for this 

We have reduced the Memory consumption to 104 via GPO  (Set limit on megabytes of memory a single Microsoft Edge instance can use) maybe that is reason but increase them did not solve that issue. 

Thx for any help

Erik