XBOX 360 Wireless Connection Problems

[Begen]

Hey, I'm just wondering about some wireless problems im having with my xbox 360.
Whenever i try to sign into xbox live, it says there is a connection problem.
When i go to test connection, everything gets confirmed no problem. when it gets down to the "XBOXLIVE" section it tries to connect, and then my wireless connection gets cut throughout the household, to all 3 of my comps.
what happens is that all the internet connection gets cut and then reconnects itself. not that this only happens when i test my xbox connection.
anyone have any ideas what the problem is? please im open to anything! i had this same problem last year, and have had no connection problems until today, not sure what the issue is.
anyways hope anyone can lend me some ideas, would be much appreciated, thanks!

Begen,

 

[Flymop]

What did you do to sort it out last time? Or did it just sort itself out?

Probably wont help but try taking out all the wires and putting them back into everything just to make sure one hasnt come loose or anything. Create a new account on your router as well that usually helps (its what I did the other day to fix my mates internet)