The following is a quote from a user-supplied answer on another Q&A site that is hosted by Microsoft:
Hi, this may be due to wakeon lan feature, Please turn it off and check
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.
6. You can enable Wake on LAN for all wake methods or just enable magic packet WoL:
- To enable Wake on LAN for all methods, check the Allow this device to wake the computer check box.
- To enable Wake on LAN for magic packet only, check the Allow this device to wake the computer check box and then check Only allow a magic packet to wake the computer check box.
- NOTE - For devices that do not support ARP and NS offloads, Windows will default to wake only on magic packet.
7. Click OK.