FYI, upgraded to 4.8.1-040801-generic, WiFi has no problems now.

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  wifi stops functioning briefly after connecting to network

Status in linux package in Ubuntu:

Bug description:
  On Lenovo W530, after upgrade from 14.04 to 16.04:
  Although wifi card is still connected to the wifi-router (network manager 
states so), no user traffic is passing through after a few seconds from 

  Workaround: 'iwconfig wlan0 power off' executed after the connection
  becomes unusable brings it back to operation.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-36-generic 4.4.0-36.55
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC1:  kgar       4992 F.... pulseaudio
   /dev/snd/controlC0:  kgar       4992 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Aug 31 10:48:01 2016
  HibernationDevice: RESUME=UUID=eeaac5ff-7cb9-4674-963c-2641065f84b6
  InstallationDate: Installed on 2014-01-17 (956 days ago)
  InstallationMedia: It
  MachineType: LENOVO 244759G
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic 
root=UUID=20cbb6d9-2c69-427b-a27f-09a0787436b9 ro quiet splash
   linux-restricted-modules-4.4.0-36-generic N/A
   linux-backports-modules-4.4.0-36-generic  N/A
   linux-firmware                            1.157.3
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-08-13 (18 days ago) 02/27/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G5ET92WW (2.52 )
  dmi.board.asset.tag: Not Available 244759G
  dmi.board.vendor: LENOVO
  dmi.board.version: Win8 Pro DPK TPG
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvrG5ET92WW(2.52):bd02/27/2013:svnLENOVO:pn244759G:pvrThinkPadW530:rvnLENOVO:rn244759G:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable: 244759G
  dmi.product.version: ThinkPad W530
  dmi.sys.vendor: LENOVO

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