Sorry for the delay but I have finally got time to perform more tests.

# Testing with other devices
I've observed, that switching to other WiFi hot-spot makes a difference: the 
problem is only observed, when "Lenovo W530" (Ubuntu) connects to "Speedport W 
724v typ A". When testing with another hot-spot device or when testing hot-spot 
with another device, everything works flawlessly. Hence, it looks like some 
kind of compatibility issue.

# Testing Ubuntu Kernel-4.4.0
After system start:
        - always works
After wake-up:
        - rarely works
        - sometimes re-connecting to WiFi suffices
        - more often WLAN PM must be disabled

# Testing mainline Kernel-4.8.1
After system start:
        - always needs a re-connection to WiFi
After wake-up:
        - always works

# Further steps
I've noticed bios-outdated-2.65 flag added to the bug.
I'd like to update BIOS and see, if this could be solved that way.

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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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