Stainless will rust. Alot depends on type of soap used and if you leave wet utensils and dishes (metal ones) sitting in the sink. You probably don't notice it at home because your sink at home is probably better quality. You can call CR but my guess is they won't replace it.
Stainless stell comes in many grades and some can rust. As Stan stated leaving metal utensils in the sink can react with the stainless and cause rust. It is the nature of the beast, but I would check and see if they will replace it.