The hazard warning lights on my Megane Dynamique Cabriolet have developed an intermittent fault and come on at random times. This can happen when I am driving along, or when the ignition has been turned off and the key removed . The control switch does not work to to turn them off. This seems to be related to the weather and air temperature., ie it has happened a few times since the temperature has dropped and also in heavy rain. Any suggestions?