Afternoon Andrea
My bet would be the Slip Spring behind the steering wheel is at fault. A diagnostic would confirm if you have access to BMW 1.4.0 or similar (not expensive to buy and worth its weight)
Take a look at www.realoem.com put the last 7 digits of your Vin into the search box it will bring up your model. Then look at the Steering section, the small exploded drawing will give clues to what fits where plus there will be part numbers that ensure you get the correct part for your model if replacing it is required. Also if you double click the part number it should give a list of any alternatives available
Good luck with the fix
Dave