not likely but replace the cord if it makes you feel better, if I had my guess something is dead or quickly dying, could be silicon, could be a capacitor, if your not grasping the basic function of a circuit breaker I dont suggest you go poking around something connected to current strong enough to weld plate steel while boiling water, drying your clothes and putting out hundreds of watts of light with plenty to spare
if your in the USA your breaker is probably 15 amps with 110-130 volts behind that, its enough to make a coat hanger melt, replace the power supply