I had the problem of people not hearing me after I dropped it.
I considered it broken and bought a new one.
The headset is great but the earpiece is a desaster.
A friend who is a dental technician made me a silicon earpiece based on
the unfortunately discontinued Bose Headset II earpieces.
Now it stays in the ear rock solid:
[https://www.dropbox.com/sh/l21ia7edr7cmxkl/AADbYzVy3TObJG7rU_aVeNPMa?dl=0]