I just downloaded and uppdated the drivers for my Intel wifi card. Made a reboot of the computer after this.
Then when puting the computer in sleep mode, and waking it up again, the problem does still exist. Wifi Card is disabled and not possible to activate again. I need to reboot the computer to get the wifi card working again.
Wifi Card: Intel(R) Dual Band Wireless-N 7260
OS: Windows 8.1 64 bit.
Intel Driver: 17.12.0.4
Power Management settings: Allow the computer to turn off this device to save power = disabled
Windows Power Options: Wireless Adapter Settings - Power Save Mode - On battery = Maximum Performance