Utilising the taptic engine, the vibration noise on my 6s plus seems much weaker than the old 6s plus - which is good. However, I noticed that when having the 6s plus upside down (i.e. screen facing directly downwards), the noise intensity of the vibration dramatically increases, to the level approaching my old 6 plus. This increase in noise level only happens when the phone is upside down, vibration noise is much quieter when having the screen facing upwards. Anyone else noticing this?