I don't know if mine have any problem, but I will tell you what bothered me.
From 25% to 100%, the only thing that changes in the sound is the tremolo from the bass.
The more you increase it, the more it trembles and it annoys me incredibly!
The sound of the music is very low, while in the descriptions it says that it is super and so on..
It also sounds like the speaker is broken. It's like listening to an old, low-quality radio where the bass trembles instead of actually hearing the bass.

Something happens during the call..

I hope it's really an isolated incident and not like this in this situation.

Otherwise, it's not worth the almost €190 I paid. I'm sorry!

If someone knows what I mean and can help me, any action and suggestion is welcome.

One of the best purchases I have made in years. I am a long-distance cyclist, and from the moment I put them on, I was amazed. The sound quality, microphone quality, you don't even realize you're wearing them. They don't go inside your ear so you don't hear what's happening outside. They don't come off in any way (no matter what kind of in-ear headphones I had, they would come off and I would lose the ambient sound).

CAUTION: They are not suitable for motorcycles, solely because no one can hear you after 40-50km/h. The audio quality is more serious than I have mentioned... unusually impressive, crystal clear, NOT with the intensity of in-ear headphones but literally incredible 3D sound with every detail.

The durability, so far, seems very sturdy.

I am just a regular cyclist, I have no commercial relationship with anyone, nor any friendships with a merchant. With the few reviews I have done so far (maybe this is the 5th in 15-20 years), I try to help my fellow humans with items that I personally consider to be of great value.

For athletes and non-athletes... the money is quite a lot, but for what it is, it's worth getting them once... I don't know when the second time will be.