I talked to warranty and they have never heard anything like this. On the retail fridges we normally put you in touch with a local repair shop.
If you want to shoot me your VIN, zip code and contact info I can have our guys look into it. But as you have already found, with a cold freezer and no air going into fridge, defrost normally solves that. If not, could be a bad fan or temp sensor.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).