I should have said "A" known cause, certainly very common. I'm not saying your dealer is wrong, but it's not unusual for dealers to get things very very wrong. I hope they sort your car out. It's an annoying problem because it also stops the cruise working :cry:
I guess there might be a...
The known cause of this issue is the brake switch. I suspect if there was a hardware issue with the steering rack then you might have noticed it before now. I put it to you that your dealer is a chancer like 80% of them. :wink: