The answer to 'why is my switch buzzing noise' is that a buzzing or humming sound coming from an electrical switch is typically caused by a loose connection or a problem with the switch itself. This can happen due to age, wear and tear, or improper installation.
A buzzing switch can indicate an electrical issue that needs to be addressed, as it can be a fire hazard if left unresolved. The buzzing sound is often caused by the vibration of the switch components, which can be a sign of a loose connection or a problem with the switch mechanism.