Motherboard Ethernet shutting itself off?

The Ethernet port on my mobo keeps shutting itself off. (also shuts off the green/yellow light that is on when the ethernet is active).

I have to manually reconnect the ethernet cable in order to reactivate my ethernet port.

P2D CPU
T43 Biostar Mobo
500Watt OCZ PSU
5770
4GB RAM
Vista64bit

Does anyone know what is wrong? Btw, I had crashed to a black screen before this happened.
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More about motherboard ethernet shutting
  1. Dig down into "Configure" in the Properties of your network adapter to the Power Management settings -- untick anything about letting Windows turn off the device to save power.
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