Gemini remote issue

When using the Gemini microphone remote, the responses most often differ to "Try Saying ..." and go nowhere.  Only occasionally do they work - like "go to Netflix".  Should I be holding down the mic button longer, or less?  Is there any particular procedure I should follow?  I am a little older and I miss instruction manuals!!  I also expect to see the screen respond when the button is down before I give an instruction, it does not, unlike original Directv remotes.  Your help is appreciated.  ED