By the seller immediately sent me a new pair of headphones. - Thank you for that, really a super customer !!
Unfortunately, even this replacement headphone now have again the same defect. So it is not because of a "Monday" model.
The headphones I therefore can not recommend. The seller already.
UPDATE: I have now received by Memory King again sent new headphones. These will be included in a new, improved batch. I'll try them and then adjust my rating. Once again I would like to draw attention to the above-average support by Memory King.