ANSWER:

Change the settings in advanced power profile properties so your LAN adaptor doesn’t goto sleep/power down.

This can be disabled regardless of your network adaptor.

Source: Microsoft Technet

Configuring power management using the user interface 

To turn power management features on or off

1.
Open Network and Sharing Center (click the Start button, type Network and Sharing in the Start Search box, and press Enter).

2.
Click the Change adapter settings link in the upper left of the navigation pane.

3.
Right click the network connection you want to enable/disable power management support on and click Properties.

4.
Click Configure.

5.
On the Power Management tab, check or clear the Allow the computer to turn off this device to save power check box.
When checked, power management is enabled on the network adapter. 

When cleared, power management is disabled on the network adapter. 

by HaydnWVN from http://superuser.com/questions/411630