When I bought it, I enjoyed it incredibly. But at one point I noticed that the right earpiece became quieter. I thought - it seems to me, turned, twisted, asked the girl to check - she confirmed. And this problem sometimes appeared, sometimes disappeared. She appeared when a little bit straightened the right cup. And I'm not the only one with this problem. I don’t know what to do with it, carry it under warranty - they will easily say that everything is fine.