When you say the button was flashing, was a consistent flashing, like a blinking? Or was it more flickering on and off? If it was just flickering, it could just be a bad connection to the LED light. If it was steadily blinking, then it almost seems like an indicator for something. However, if something was actually wrong, you would think that a light on the dash would go on instead of a little bit of flashing from the foglight button.