Hi Ariane, if nothing else, it's good to be able to rule out one possible cause. Other reasons a cake can fall include using too little or too weak flour, using too much leavening, and as you mentioned, opening the oven door before the cake has set, as this lowers the temp of the oven and disrupts the bake. Since there are so many factors that may be at play, we encourage you to give our free Baker's Hotline a call at 855-371-BAKE to troubleshoot directly with one of our bakers. We'll be happy to try to help you get to the root of the problem! Mollie@KAF

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