Wi-Fi disconnected suddenly

[Pascal Francq]

Hi,
After a little upgrade yesterday (mostly packages related to KDE Plasma), my 
Wi-Fi connection is disconnected. In the network applet, I cannot click to 
enable it. But the card is recognized (and it is active at the hardware 
level).
I suppose that is it linked to network-manager but I have no idea how to solve 
it.
Thanks.
-- 

Dr. Ir. Pascal Francq
BELGIUM