Over the past couple weeks I've noticed that my airport extreme's wireless signal has gone down. I bought it new in 2004, and it's always had a full signal everywhere in the house on multiple computers. Now the signal strength seems to be kinda random, somedays I'll have full signal and somedays it will drop to one 'bar'. I should note that it does have the latest firmware installed, and this happens on multiple computers new and old. So my question is if anybody has had this experience with airport extremes, particularly older ones?