I recently dropped my iPhone 7 in Apple silicone case onto concrete. No visible damage but I noticed that when I'm using the phone the bottom right area (where the loudspeaker located) is slightly warm to touch. It even gets warmer when I'm listening to the music through the loudspeaker. Is it possible for a drop to cause such a problem, considering the drop is only about from 1m height and the phone is using a case? Or is it normal for a speaker to get warm when in use?