Problems with powering on the "Taotronics tt-bh085"

I hope this is the right forum, otherwise please tell me and I will take the post down. I have had the above-mentioned overear headphones for almost half a year and so far they have actually worked without any problems. However, I can no longer turn on the headphones. When I plug them in, the charging LED lights up blue after a while, even when I activate ANC it works and lights up blue. When I connect the headphones with a cable, everything works perfectly. But it is not possible to turn them on normally. Could someone help me here or know how to reset the headphones.

Question by OffByOne on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.