TJ - Look in the vicinity of the wood box, heating element, back wall. You will see a probe. This is the bulb in a bulb and capillary control unit. This bulb or sensor is filled with a liquid that travels up to the temperature controller on the top of your smoker. There is a fine hollow wire (capillary) tube that runs from the bulb through the cabinet and insulation to the controller. This capillary tube is only visible off the end of the bulb till it disappears into the cabinet. But it is what causes your smoker element to cycle on and off. Just check the tube and capillary for anything that looks like it doesn't belong there (paper, tape, styrofoam, foreign matter) and gently remove it.
Hope this helps.
Dave