Need to install systems out of the driver feed
When creating the own driver feed the installation of the WLAN driver causes the NIC driver to reset, which breaks the connection to the K2 which failing the post installation tasks

Tested configurations:
self grown PC with RTL8168 and TP-Link TL-WN851ND, W7 x64, W8 x64
Inspiron 5721 (17R) with Realtek PCIe FE and Intel Centrino Wireless-N 2230, W7 x86
Latitude E6530 without the built in driver feed
self grown driver feed (Driver harvester and double driver tested)
Scripted installation and imaging tested

If the WLAN is deactivated (or not installed) the post install tasks run through.
If the WLAN is activated, the installation breaks during the driver feed is installing the WLAN card.
The E6530 installs fine with the built in driver feed but fails to install 1 out of 5 times with the same errors.
It seems that the Realtek NIC causing this issue

1. (simple solution) install without activated WLAN card and install it via a MI with the K1000
2. (more complex solution) create a post installation for this WLAN driver only
    Capture the questioned driver with driver harvester or dd and install the driver with pnputil using this command line:
    xcopy "\\drivershare of the K2000 or a file server" %windir%\inf\wlan\ /E /H /Y /I /Q /V pnputil.exe -a %windir%\inf\wlan\oem61.inf
    A reboot is nessesary directly after this action to make the WLAN driver work