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My blender would do that if I didn't screw the jar on firmly enough. Sometimes the action of the blades will even loosen the bottom from the jar during blending, so I always hold the jar handle while the blending is going on. That way if it starts to undo, I can twist it back tight. Before I learned that trick I had smoothies leaking out the bottom - what a mess! Also make sure you put the gasket/seal on in the right order. If it's in the wrong place it won't seal correctly.