You can try this:
Disable the Wake on LAN feature. Essentially, the computer is set to automatically wake up from network traffic, which seems to include pulling out the cable.
To change this setting, type in Device Manager into the start menu search box, and then browse down to “Network Adapters” and find your network adapter. In this case, mine is ”Broadcom NetXtreme Gigabit Ethernet”.
Right-click it and choose Properties from the menu. In the resulting dialog, choose the Power Management tab.
Still facing the problem try to restore your pc & run antivirus program.
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