Cannot reconnect to my hidden network with plasma-nm on KUbuntu Trusty 14.04.5 LTS

Hi,

After my ISP home router is being rebooted, my KUbuntu Trusty 14.04.5 LTS does neighter reconnect to my hidden wifi network automatically nor manually with the Plasma NM applet.

The ONLY workaround I have found so far is by typing the following command :

$ nmcli con up id MyWifi

knowing that "MyWifi" is my hidden wifi connection name in the applet (my "ESSID" is different)

Btw, I'm using kernel "4.4.0-64-generic" and "plasma-nm" version "0.9.3.3-0ubuntu1" :

$ lsb_release -sd
Ubuntu 14.04.5 LTS
$ uname -r
4.4.0-64-generic
$ apt-cache policy plasma-nm
plasma-nm:
  Installed: 0.9.3.3-0ubuntu1
  Candidate: 0.9.3.3-0ubuntu1
  Version table:
 *** 0.9.3.3-0ubuntu1 0
        500 http://fr.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
        100 /var/lib/dpkg/status

Can you please have a look and try and fix this bug ?

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager 0.9.8.8-0ubuntu7.3
ProcVersionSignature: Ubuntu 4.4.0-64.85~14.04.1-generic 4.4.44
Uname: Linux 4.4.0-64-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.23
Architecture: amd64
CurrentDesktop: KDE
Date: Sun Mar 5 19:47:51 2017
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2016-09-22 (163 days ago)
InstallationMedia: Kubuntu 14.04.5 LTS "Trusty Tahr" - Release amd64 (20160803)
IpRoute:
 default via 192.168.0.254 dev eth0 proto static
 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.14 metric 1
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 wlan0 802-11-wireless disconnected /org/freedesktop/NetworkManager/Devices/1
 eth0 802-3-ethernet connected /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.8 connected enabled enabled enabled enabled disabled