French

Hello everyone, I've bought a M40 nearly a year ago and it´s the fourth time that my noise-cancelling system doesn't work. Repaired two times and changed by a new one the third time,the system is broken again,before the end of the battery's life..... I'am very disappointed by this problem and believed that your brand was "the top", as we say in France. Sorry for my "french", but did anyone meet the same problem? And how to fix it? I approach the end of the guarantee and i'm afraid of what is going to happen after. Best regards. French.