Comment 67 for bug 1585863

Christian,the failure occurs to me even in a stationary scenario, it does not occur at all suspend/resume cycles, but randomly. (I could not establish a pattern anyway)

In fact, what you described never occured to me, the network-manager UI doesn't show a stale list of wifi networks. In my case the list of access points appears empty and thus cannot connect to any.

Running the wpa_cli scan command, or wpa_cli resume, or restarting the networkmanager, makes the access points reappear and the connection is instantaneous with the preferred network.