As a side-note, as it seems it's been triggered for my laptop by the update to 
network-manger 1.2.4, one of the few fixes included in 1.2.6 is the following:
* Fixed a bug that caused devices to stay unmanaged after resume from sleep.

So quite probably, updating network-manager to the latest stable version
will help....

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  WiFi malfunction after suspend & resume stress - sudo wpa_cli scan
  required to fix it.

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