The answer to 'why is my junction box flickering lights' is that it is likely due to a loose connection or faulty component within the junction box. Flickering lights can be caused by a variety of electrical issues, but the junction box is a common culprit. This is because the junction box is where multiple electrical circuits come together and can be vulnerable to problems.
Some common causes of flickering lights from a junction box include loose wire connections, a failing circuit breaker, a bad outlet or switch, or a problem with the wiring itself. Symptoms may include intermittent flickering, dimming, or pulsing of the lights. In some cases, the flickering may be accompanied by a buzzing or humming sound from the junction box.