The cake rises during baking but then collapses or sinks in the middle. This is a recipe/technique issue rather than an appliance fault.
| Possible Cause | How to Fix |
|---|---|
| Temperature too high / time too short | Lower temperature, extend time |
| Batter not mixed properly or left to sit too long | Mix well and bake immediately |
| Insufficient egg-white foam for whisked sponges | Beat longer, fold carefully |
| Too much baking powder | Follow recipe instructions precisely |
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