If you have an F30, its not the SZL, that was a problem to E60's and E90's...I had same issue and it was the connection between the steering wheel and the column...one of the pieces that you unclip to remove the steering wheel. When I took it to the dealer they ended up replacing the actual cruise control switch on the steering wheel and the problem went away. (wire and connection was attached to the actual switch.) BMW has a TSB about this very issue.
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