Modern design, compared to Beko predecessors better processing, problems with Ökowaschgang

Was surprised by design and processing, almost better than the come in the picture over. Something a lot of programs, you have to read in order to understand all. Unfortunately, it always smells foul, if I let the machine run at 40 degrees Ökowaschgang. In the normal cycle that never happens. Have already tried everything possible, (controlled hoses and cleaned, disinfecting the machine, ...), but nothing helps. Now I no longer wash halt with this wash and in the other the machine gives very satisfactory results. I'm glad if someone still has a tip to the problem with the Ökowaschgang me.