The answer to 'switch buzzing noise' is that a buzzing sound coming from an electrical switch is often caused by a loose connection or a problem with the switch itself. This can be a sign of an electrical issue that requires attention.
Some common causes of a buzzing switch include a loose wiring connection, a worn-out or damaged switch, or an overloaded circuit. The buzzing noise may be accompanied by flickering lights or intermittent power. In some cases, a buzzing switch can also be a fire hazard, so it's important to address the issue promptly.