I have the same problem! Have six cordless phones and similar problem on most of them.
Allan Levine
allevine@comcast.net
I work at a small law office that purchased and used a Panasonic cordless phone system. The problem was that the #1 button stopped working shortly after purchase. I have talked with a number of other people that had the same problem. I am thinking of bringing a class action lawsuit against Panasonic as I and others I spoke with were very upset about this problem. Has anybody else had the same problem?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic