How fast is you internet? Cos if it's only say 2mb whats the problem? could always use a wireless bridge.
I've got the previous to orange which is wanadoo, i have the same problem, try changing the channel on the livebox by going onto the short cut on your desktop. It has sorted it only goes down to 1mpbs once in a while as opposed to what it used to do which was all the time. I've got 2 meg speed cos thats all thats available in my area. hope that helps