[Bailey]

Like Jim said.
Check to see if the whole column is moving, or the steering shaft within the column. There is an upper and lower bearing, both BMW parts. I have replaced both. I believe the carriers were plastic, and with some wear and vibration caused by improperly balanced wheels, it might be what is going on.
Next the cowl brace and windshield are bolted in. Verify that ALL the bolts are tight. I check mine every few months. Even with lock nuts, they seem to loosen up.
Also follow Jim's advice again. Check the U bolt clamp that secures the column under the dash.
Keep us posted,
Richard Bailey