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The malfunction described in the question is most likely associated with an Annular Phased Array transducer. Annular phased array transducers utilize multiple smaller elements arranged in a ring or annular pattern. This design allows for the shaping and steering of the ultrasound beam electronically, providing flexibility and improved image quality. Malfunctions in this type of transducer can impact beam steering, focusing, or overall image quality.

The other options (Linear sequential array, Convex sequential array, Mechanical) do not typically exhibit the same issues described in the question. Linear sequential arrays are known for their image quality and sector scanning capabilities. Convex sequential arrays are commonly used for abdominal and obstetric imaging, offering a wide field of view. Mechanical transducers rely on physical movement for beam steering and are not as commonly used in modern ultrasound technology.