Hi, A friend just upgraded Infotainment to MCU2.0 on a 2017 Model S. He is experiencing these clicking noises and immersing sound for the other party, but only on phone calls via Bluetooth, not when listening to Music. Service tried twice to repair, and replaced the microphone once. Finally, admitted "A known problem" and a "Firmware issue" but no solution was offered, does anyone have a solution? Did anyone get the issue resolved?