Thank you for asking your question on JustAnswer. This is a common problem that happens after cleaning a range or if a pot boils over. Moisture will cause this problem. Use a hair dryer and blow the air over the area and the popping will stop.
Blow hot air on the knob. Hopefully this will stop the problem. If the controls get any moisture in them they will click constantly when they are turned off. Please do not accept unless this corrects the problem.