811595 (http://support.microsoft.com/kb/811595/ ) "A network cable has been unplugged" message appears at seemingly random intervals
The value for the Media Type property on the network adapter may be set to Auto Select. This property is located on the Advanced tab of the network adapter properties dialog box. To resolve this issue, change the value of the Media Type property to a specific bandwidth. For example, set the value to 10Mbps/Full Duplex, to 100Mbps/Full Duplex, or to an optimum value.
Note The steps to change this property vary depending on the manufacturer of the network adapter. In most scenarios, you can follow these steps to change the value of the Media Type property:
Click Start, click Run, type ncpa.cpl, and then click OK.
Right-click Local Area Connection, and then click Properties.
On the General tab, click Configure.
In the resulting dialog box, click the Advanced tab.
In the Property list, click Media Type or Link Speed & Duplex or something similar.
Note If these properties do not appear, look for a property that has the values Duplex and Half-Duplex.
Click a specific bandwidth in the Value list, and then click OK.
Close the Network Connections dialog box.
Test the network connection.
If these steps do not resolve the issue, repeat steps 1 through 5, and then click a different value in step 6 until you have tested all values.
