I have a 2002 S3 and recently I've had an intermittent brake light bulb fault showing on the DIS. However, I've checked the bulbs and they are fine. The fault clears the next time I press the brake pedal. It happens quite infrequently, maybe once or twice a week. Anybody got any ideas what could be causing it? I've checked the obvious, like if the bulbs or connectors are loose.