This is normal when you have wrinkle prevent option on. The Wrinkle Prevent option can be selected or deselected for every cycle. It is 90 minutes long and the dryer keeps running for the first 20 minutes of the 90 minutes. After that, the motor cycles off and on for the remaining 70 minutes; 5 minutes off and 10 seconds on. During this 90 minutes, the Wrinkle Prevent light on the display is flashing and the display itself will appear to have marching ants going around the outer perimeter of the display.