For a few days I have had the following problem: When I’m a relatively slow speed the scooter jerks. This is not the case with (otherwise usual) full throttle speeding. I had the lid of the Variomatics already open, but could not find a worn strap or any other abnormalities. After I’ve driven about 25,000 km The Variomatics has already changed, I tap on the Clutch. Is there something special to consider/could it be the Vario? Thank you for your answers!