Ethernet problems

I have this problem ...sometimes when I turn on my 360 the message show up on the screen and say system error E73....I found out, that is the problem with ethernet connection...for those who doesnt know , this mean that I can't use xbox live...

Is this a way to general hardware failure or three red lights of death ??

thanks..( and sorry for my english );)

does anyone know anything about ethernet problem ??

thanks