Did you find out what the problem was? I am having exact same issue on 4 month old fridge model RF28HFEDBSG/AA. Blows too because we just went grocery shopping earlier today and all that goes into the trash because it showed correct temp but wasn't (figured it out when I got some ice cream that was melted). When unplug and plug back in, then showed actual temp at 34 freezer 66 fridge. It starts cooling again but after about an hour it stops again. Already sent service request and really hopeing it's going to be a couple days not weeks. I could understand if I had an older fridge but 4 months old??
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