Hello, can you help please. Late last year I bought at 2008 Z4 2.0i car. It hasn't been used over the winter, but yesterday I took it out for the first time and found that when I operated the wipers from the column switch the wipers would start, sweep about 10 times then stop at random on the screen, the only way to restart them is to switch the ignition off and on again. Then they would sweep for a further approx 10 times, stopping again. It is not possible to stop them from the wiper switch, the speec cannot be changed and when the blades stop the washers will not work. Any advice to resolve this matter would be gratefully received. Thanks very much.