I've run into this with my x220 which was recently upgraded to Xenial as
well. It is not consistent; it happens at maybe 1 out of 3
suspend/resume cycles.

Removing and reinserting the iwldvm module also fixes the issue, but
kudos to Haw for noting that it doesn't seem to be a lower-level bug but
rather in NM itself; as he suggests, a `sudo wpa_cli resume` triggers a
reconnection.

Toggling the kill switch does not cause a reconnection to happen, nor
does disabling and reenabling wifi.

The UI symptom is that the list of available networks in the dropdown
does not update; either a single item or no item is displayed, and no
reconnection happens (regardless of whether or not the item displayed is
one which you have associated with before).

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https://bugs.launchpad.net/bugs/1556357

Title:
  WiFi fails to resume after suspend; Race with wpasupplicant / wpa_cli
  resume?

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