Why does my Note 5 go on auto mute when calling?

[AC Question]

Note 5 goes on auto mute when calling

It has started recently that half my calls people are unable to hear me

 

[B. Diddy]

Welcome to Android Central! Do you see an actual mute icon appear, or is it just that no one can hear you? Does this happen with wired or Bluetooth headsets as well, or on speakerphone?