I have the same issues with my MS100D (March 2018), the fan always runs between 5 and 7 fanspeed with a lot of noise even when the cabin temperature is at setpoint. In my opion the temperature controller is not very acurate as well, but this issues where pressent car since I received the car and havent improved during the many software updates.
They need to tune the PID controller for the temperature and fanspeed. Now I need to change the fanspeed en temperature on hourly/daily basis.
In my Audi A6 I never touched the temperature or fanspeed controller, it was always at a stable temperature and I only heard the fans running when the car was realy hot or cold, when it achieved setpoint no noise at all and always a stable cabin temp.
My temp is set at 19 degrees celsius (66 Fahrenheit) and sometimes I break down in sweat because of the heat and 15 minutes later my legs freeze. Hope they solve this to improve the comfort!