Big Sur 11.3 bricks Avid Control App and EUContrl

[Stamak]

Until today Avid Control (on I Phone 7plus -IOS 14.4) worked with EuControl
without a hitch in Pro Tools 2021.3.1
I updated my MBPro to Big Sur 11.3 and now the Avid Control App cannot connect to Pro Tools and EuControl version 2020.11.1 will not start.
''EUCON network connection not found''.

My Apogee Control App works fine with Apogee Ensemble so the Wi-Fi is OK.



Question : Is this a software problem with the Avid Control App or

EuControl or is Big Sur the cause of the problem?.


Any ideas how I can solve this.


Many Thanks



Stan McKee