On waking from sleep laptop does not re-connect to wifi

[Raphael Mankin]

After waking from a suspend my laptop (Lenovo X1 Carbon) does not always re-connect to the wifi network. It seems to be consistent in which networks (access points) it will connect to and which it won't.

I cannot force it to reconnect using the applet to 'connect to hidden network'. It says that the connection is invalid, and the 'connect' button is greyed out.

Logout/login does not clear the condition.

After a reboot the machine connects with no problems.

There is a similar problem with *some* new wifi networks in that after configuring the new connection I have to reboot in order to use it.

 lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.1 LTS
Release: 16.04
Codename: xenial

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: systemd 229-4ubuntu16
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Jan 30 10:30:40 2017
InstallationDate: Installed on 2016-12-03 (58 days ago)
InstallationMedia: Xubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
MachineType: LENOVO 20BSCTO1WW
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-59-generic root=UUID=bdcf7727-2f44-4156-a81e-5d5088717dd2 ro quiet splash vt.handoff=7
SourcePackage: systemd
SystemdDelta:
 [EXTENDED] /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
 [EXTENDED] /lib/systemd/system/systemd-timesyncd.service → /lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf

 2 overridden configuration files found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/14/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: N14ET36W (1.14 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BSCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN14ET36W(1.14):bd07/14/2016:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BSCTO1WW
dmi.product.version: ThinkPad X1 Carbon 3rd
dmi.sys.vendor: LENOVO