I have a circuit on a 20 amp single pole breaker. All it has on it is two lighted ceiling fans on 1 single switch; it operates both ceiling fan lights and fan. It has a receptacle as well. My panel is around 35-37 years old. That is all that is on that circuit. What could be possibly wrong with the circuit? I checked Voltage on everything. It reads 120v very good. It might stay good for 2-5 days then loose power on everything on that circuit.