Looking for roon core...........on IOS 13.6

Two ipads side to side. Both are in the same segment as Intel Nuc wich hosts the Roon core.
One of them connects to Roon core without problem. The other one does not.
When i start Roon client it hangs on “looking for Roon core”.
This ipad that now fails used to connect without much trouble. It happens after updated to Ios 13.6.

Try a cold boot of the offending iPad.