The first doll I had who came down with this problem was a 1995 AGT (blonde with gray eyes). When I called customer service about it, I was told that it only happened to dolls made around 1995 with gray eyes -- like Molly and the AGTs. This led me to believe that it was a defect in gray eyes of a certain period. Since I've been on this Board, I know this isn't true. Plus my first (1995) oriental AGT had it happen last summer and she has black eyes. And a very early Samantha (maybe 1989 - 1990?) I bought from ebay has the color in both her eyes changing so instead of brown, they've faded to hazel. Clearly the defect isn't limited to a certain production cycle or eye color!