Lasts no 1

The finish and the sound quality sound good except that the kit lasts one month to break everything ...
I use the hands-free kit all the time for years. I know this is kind of consumable, after 6 months, a connector, HP no longer works ... ... it must be replaced either.
But here is the ponpon: I bought 3, the first lasted one month, HS connectivity. The 2nd 3 weeks, onset crackles in HP .... I just unpack the 3rd ... how long Will it last?
I made the first repay the kit by the seller without pb. But I am very disappointed by the poor reliability of the kit. It will take me are others ... and not HTC ...