Computer making internet cut out

Hello, I just a new motherboard yesterday an ASUS P7P55D. Running windows 7 and using ethernet, the internet would cut out after a few minutes and come back again by itself and cut off again. After turning on xbox live i realised that my computer is causing problems for the router and cutting off the connections. Could anyone help me fix this please?
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  1. To eliminate the router as a problem have you tried connecting directly to the PC for a day or two to see if the problem goes away (no internet outages when you go straight from the modem to the PC)?

    That would be my first step.

    If the internet works fine when the router is not plugged in that could narrow it down a bit for people to better help you.

    Also, is the new motherboard have the network set up with DHCP enabled?
    ( http://wireless-network-support.blogspot.com/2010/02/how-to-enable-dhcp-on-windows-7.html )
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