It does sound like it could be chemical or sun damage or something like that. It could be the fault of the store rather then the manufacturer. I would hope that either would be willing to work with you.
who is the yarn manufacturer and name of the yarn? Perhaps someone else has had experience with the company in general or the specific yarn.
Mirl56 at Ravelry, too.
Learn from the mistakes of others. You canít live long enough to make them all yourself. Eleanor Roosevelt
Lady Feb Sweater
more shawlettes, socks