I have a 2003 disco TD5 auto diesel. Occasionally the traction control and (!) warning lights will illuminate together whilst driving. The lights go out again when I restart the car and might not come on again for weeks. There is no pattern - not on rough or bumpy ground. Today it happened just as I drove into a car park. Lights weren't on when I restarted the car a couple of hours later and didn't come back on for rest of day. Any ideas please? Thanks. Paul