FP2 apps&Wifi unstable after update to OS 21.03.0-rel.2

I updated my FP2 to OS 21.03.0-rel.2.
Since then my Whatsapp is unstable when making videocalls. It salways says poor conections and sudenly stops. Where as wifi and mobile connections are good and stable.
Also my VPN app is unstable. It will connect correctly, but closes by itself when start browsing.
Over all the OS is unstable. Sometimes working swiftly, sometimes having difficulty in starting up apps.

Any one any clues?

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