Have you tried the port on the router and the cable that work with your pc? Could be a dodgy one of them? Also unplug the router completely from the wall for a couple of minutes rather than just resetting it.
If that doesn't help then...as Deckard says so eloquently...somethings definitely fucked.
Edited by Buztafen at 19:10:35 18-04-2013
#9514885, By Buztafen XBOX live keeps disconnecting every 3-5 mins
Buztafen 16,744 posts
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