The answer to 'junction box hot to touch' is that a hot junction box is usually a sign of an electrical problem that requires immediate attention. This could be caused by faulty wiring, a short circuit, overloaded circuits, or a loose connection in the box.
The symptoms of a hot junction box include the box feeling warm or hot to the touch, sparks or arcing visible in the box, and potential tripping of the circuit breaker. This is a serious issue that should not be ignored, as it poses a significant fire hazard. If you notice a hot junction box, it's best to turn off the power to that circuit immediately and call a licensed electrician to diagnose and repair the problem.