Most likely no. Might be your airport finally going to crap like so many others who have connection problems with their airport. For me, sometimes my airport will have no problems, downtime for the whole month, sometimes... it'll last only a few days before I have to reset the base station again. But just to make sure if it's your airport or not... have you tried resetting it and see if that fixes the problem? If it did, than it's your airport's fault, not your powerbook. If it still doesn't work... than maybe it's your Powerbook. Just do some test and see I guess...
Ming