Welcome to the Two-Sixties! Your problem is more than likely down to water in or around the BCU I believe it's behind the glove box. Check the carpets in that area. If there wet there's a good chance you've found the problem. If there dry you may have just caught it. Either way the guys are right in saying it may be an idea to join the forum and unlock lots of great info on the cars.
How long have you had the car?

Regards