I am familiar with this problem
can you please clarify what type of "clues" or information you would like?
WHen the car does not start the simbol as described come on the dash but will not show uo up dianostic machine. Why does not start it must be something to do with the locking system on the seeting wheel that stops it from starting.
this is a common and known problem
the problem is either a fault in the CAS (car access system) or with the steering lock itself.
sometimes, a software update and new battery (along with charging system test to verify voltage never gets too low) can resolve the issue, however, more commonly, the steering column needs to be replaced (the steering lock is integrated into the column)
it is somewhat shocking that your dealer cannot suggest a path forward even without the diagnostic machine showing faults - your description is hallmark for a known issue, and the known fixes are as I've described above. I would consider finding a new dealer or complaining to BMW corporate customer service.
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Thanks for that I have thought its been this all off the time. I will go back to the dealership and put this to them. Thanks again