The answer to 'why is my switch flickering lights' is that a flickering light switch is often caused by a loose connection or a faulty switch. This can happen over time as the switch wears down or if it was not properly installed. Flickering lights can also be a sign of an electrical problem that needs to be addressed.
Some common causes of a flickering light switch include a loose connection in the switch or wiring, a worn-out switch, or an overloaded circuit. If the flickering is accompanied by dimming or flickering of other lights in the room, it may indicate a more serious electrical issue that should be evaluated by a professional electrician.