Windows might be turning off your network adapter to save power. Turn off the power-saving option in the network adapter's properties (wired network adapters only):

1. Open Network Connections.

2. Right-click the connection, and then click Properties. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

3. On the Networking tab, click Configure.

4. On the Power Management tab, clear the Allow the computer to turn off this device to save power check box, and then click OK.