Occasional audible "click" during Google response

Just wanted to shout out if anyone has this experience.  When a voice capable (I configure them with Google VA) device hasn’t been “spoken” to in a long time (I didn’t pay attention to what constitutes “a long time” but my hunch is around the order of 2-3 days), the first time the response will contain an audible click (very soft but nonetheless audible).  I will try and submit a diag next time this happens.  What other info can I collect if this happens again?