Door cuff dissolves after less than 6 months!

We were actually very happy with the machine, but now use to less than 6 months (close zippers when washing, do not overload, etc.) according to the manual dissolves at the top of the door collar on. Here are two bulges on the cuff are to ensure that the laundry is passed into the interior of the drum. These bulges dissolve, so that distribute rubber particles in the wash. The technician from the factory service now subordinated us a faulty operation of the machine. The seal had been worn down by laundry and repair to 209, - Euro cost. Does that mean that you should not wash laundry in a washing machine Bosch? Here is an extreme wear is pushed after a short time despite exclusive intended use to the customer. I'm rather out of a material or design flaw. Had machines from AEG Bauknecht and who always performs its service without problems for years. My conclusion: never again Bosch.