B4 ABS problem
 

For as long as I can remember, my B4 has had a problem with it's ABS system. I think it started shortly after it was bought new. Sometimes the ABS light illuminates and the system fails. Brakes keep working, but without ABS.
Sometimes the light goes on for a day, sometimes it stays on for a month. But everytime it goes out again and the ABS system works fine again. I think it's a fault in the wiring somewhere, but not sure. Anyone else has this?