I have a brand new BMW X5. I got a big fright when, at around 60mph, on a dual carriageway the steering wheel was suddenly jerked out of my hands. It felt like the wheels were stuck in rail tracks and I had to wrestle the car back into my lane. I finally worked out the car does this, without warning, if the wheels go onto raised white lines, or the "join" line on the tarmac. The dealership is currently closed. I will not drive the car until this is resolved. Is this an issue you have come across before? I would appreciate your advice.