[Bug 1568560] [NEW] nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

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Hello,
On Ubuntu 15.10 4.2.0-35, with network-manager 1.0.4-0ubuntu5.3
My WiFi connection is very unstable and I have to  often restart NetworkManager service (~ a dozen times every day...):

sudo systemctl -l status NetworkManager
● NetworkManager.service - Network Manager
   Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: active (running) since dim. 2016-04-10 18:17:07 CEST; 2min 58s ago
 Main PID: 27832 (NetworkManager)
   Memory: 13.8M
      CPU: 1.729s
   CGroup: /system.slice/NetworkManager.service
           ├─ 2703 /usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces --pid-file=/run/sendsigs.omit.d/network-manager.dnsmasq.pid --listen-address=127.0.1.1 --conf-file=/var/run/NetworkManager/dnsmasq.conf --cache-size=0 --proxy-dnssec --enable-dbus=org.freedesktop.NetworkManager.dnsmasq --conf-dir=/etc/NetworkManager/dnsmasq.d
           ├─27832 /usr/sbin/NetworkManager --no-daemon
           └─30448 /sbin/dhclient -d -q -sf /usr/lib/NetworkManager/nm-dhcp-helper -pf /run/sendsigs.omit.d/network-manager.dhclient-wlan0.pid -lf /var/lib/NetworkManager/dhclient-7ec429cb-9dde-4ea4-8eda-f259b66e38a7-wlan0.lease -cf /var/lib/NetworkManager/dhclient-wlan0.conf wlan0

avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  keyfile: add connection in-memory (068de9b1-513a-46f0-b4be-93462d19f68b,"lxcbr0")
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (lxcbr0): device state change: unmanaged -> unavailable (reason 'connection-assumed') [10 20 41]
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (lxcbr0): device state change: unavailable -> disconnected (reason 'connection-assumed') [20 30 41]
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (lxcbr0): Activation: starting connection 'lxcbr0' (068de9b1-513a-46f0-b4be-93462d19f68b)
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (virbr1-nic): new Tun device (carrier: OFF, driver: 'tun', ifindex: 34)
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (virbr1): bridge port virbr1-nic was attached
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (virbr1-nic): enslaved to virbr1
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <info>  (virbr0): new Bridge device (carrier: OFF, driver: 'bridge', ifindex: 29)
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
avril 10 18:17:08 samsung-ubuntu NetworkManager[27832]: <warn>  failed to enumerate oFono devices: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.ofono was not provided by any .service files

Also, each time I restart my desktop, NetworkManager generates a crash report: cf. attached screenshots.
I have tried an Ubuntu VM with the same packages related to networking and the exact same releases (same repositories), the crash never happens; the difference appears to be only the type of network connection: WiFi for the desktop vs Ethernet for the VM.

Any suggestion?

** Affects: network-manager
     Importance: Undecided
         Status: New

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nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed
https://bugs.launchpad.net/bugs/1568560
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