Noise in electronics can be caused by a variety of factors, including electromagnetic interference (EMI), electrical signals that are not properly shielded, and physical vibrations or movements that cause electrical contacts to bounce or make contact with each other. Over time, these factors can lead to changes in the electrical characteristics of a device, which can in turn cause noise to appear or change. For example, some equipment that was previously quiet may become noisy as the contacts within the it begin to wear out and make less reliable electrical connections. A device that was once stable and free of noise may start to exhibit noise as it ages and the electrical components inside begin to degrade or fail.
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