When the network is lost I can't see it either with a plugged USB wifi
dongle:

Bus 002 Device 006: ID 0bda:8189 Realtek Semiconductor Corp. RTL8187B Wireless 
802.11g 54Mbps Network Adapter
That's Realtek wiki key : TEW424UB

When the network is working I can connect with both internal Wifi and
dongle.

It is also not related to power management as the issue occurs:
- sometimes right after reboot (I can't even connect after login),
- sometimes a few minutes/hours after reeboot without having be in supsend mode.

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networ manager looses wifi connection - impossible to reconnect
https://bugs.launchpad.net/bugs/376477
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