Simmerrings of drive shafts leak – Smart 451 MHD

Hi, for the second time the Simmerrings directly on the gearbox (both drive axles) leaks.Vehicle is only 3 months old.The first time after 1 month….was repaired on warranty in the Smart Center. (Smart technician could not explain this?) (because new vehicle?) Now again….and also again, small oil stains on the patch. Have already the new appointment in the Smart Center. (guarantee) Now my question to you: does anyone have this problem with the new car or at all d hesrelated times had problems?? LG Smart-ok