We've had the "Limited Connectivity" issue since going over to 8.1 and have now resolved this by applying the following actions:
- Update to the latest WiFi driver
- In "Device Manager" go to the "Power Management" tab and untick "Allow the computer to turn off the device to save power". Go to the "Advanced " tab and under"Property" set the "Transmit Power" to "3. Medium"
- In "Control Panel" go to "Power Options" and "Change plan Settings" on your power plan then "Change advanced power settings". expand the "Power saving Mode" under the "Wireless Adapter Settings" and change both values for battery and Plugged in to "Maximum Performance"
- Once done restart machine.
After applying these settings to a fleet of 1000 laptops we've had an 100% success rate.