LA2P microphone sometimes really quiet

I recently bought LA2P’s and Im loving them, but I have one issue where when I switch a device and connect to another, and use the microphone on a Hangouts call or a regular phone call other people report that Im really quiet. I have no idea when and how this happen, but its 50% of the time when I re-pair them to a known device.

Any suggestions?

May be the microphone isn’t the earbuds but the device own.