I confirm, sometime suspend fails and syslog says:
(my ubuntu is an upgrade from 15.10 to 16.04) model: asus-n551vw

Jan 29 19:46:39 asus-n551v systemd[1]: Reached target Sleep.
Jan 29 19:46:39 asus-n551v systemd[1]: Starting Suspend...
Jan 29 19:46:39 asus-n551v systemd-sleep[16200]: Failed to connect to 
non-global ctrl_ifname: (nil)  error: No such file or directory
Jan 29 19:46:39 asus-n551v systemd-sleep[16201]: 
/lib/systemd/system-sleep/wpasupplicant failed with error code 255.
Jan 29 19:46:39 asus-n551v systemd-sleep[16200]: Suspending system…

and next the pc restart!!

Jan 29 20:39:14 asus-n551v kernel: [    0.000000] Linux version
4.9.4-040904-generic (kernel@tangerine) (gcc version 6.2.0 20161005
(Ubuntu 6.2.0-5ubuntu12) )

I tryed more version of kernel like: 4.7.3/4.8.0/4.8.3/4.9.0 but
everything sometime Fails!

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https://bugs.launchpad.net/bugs/1585863

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

Status in OEM Priority Project:
  New
Status in OEM Priority Project xenial series:
  Confirmed
Status in network-manager package in Ubuntu:
  Confirmed

Bug description:
  Description:    Ubuntu Yakkety Yak (development branch)
  Release:        16.10
  Packages:
  libnm-glib-vpn1:amd64   1.2.2-0ubuntu2
  libnm-glib4:amd64       1.2.2-0ubuntu2
  libnm-util2:amd64       1.2.2-0ubuntu2
  libnm0:amd64    1.2.2-0ubuntu2
  network-manager 1.2.2-0ubuntu2

  Reproduce steps:
  1. Install fwts by `sudo apt-get install fwts`.
  2. Run the suspend & resume stress test.
  sudo fwts s3 --s3-multiple=30 --s3-min-delay=5 --s3-max-delay=5 
--s3-delay-delta=5

  Expected result:
  The WiFi still functioned.

  Actual result:
  The WiFi can not connect to any access point and we have to execute `sudo 
wpa_cli scan` manually to make it work again.

  P.S. Ubuntu 16.04 also has the same issue.

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