The stool may be caused by a miller on the steering column for compressing and decompression. There is no one-digit solution. Sometimes it helps to lubricant the mechanical parts of the steering column. It happens that there is no lubrication completely (production defect). It is also possible to replace the elastic muff. Another solution to the problem is the weakening of the nut, which is under the electric power steering. Machines issued since the beginning of 2012 have been fixed by the manufacturer.
