I can so relate to this. For me, its almost like I lose focus, or they are talking too fast for my mind to slowly process the meaning of what they're saying. It happens all the time for me, lol. And often I say "uh huh" or nod like I'm listening, bc I hear the tone behind the words. An "uh huh" can also give my brain a chance to catch up and recognize what was actually said.