The MCU on my mid 2014 had to be replaced. It all started with the screen going black. The first couple of times a reboot resolved the issue. After about the 3rd time of this, the MCU would no longer reboot. No, AC, or control of anything. The app could not access the car either. The SC said the MCU had to be replaced. I have already had to reboot the screen twice in less than a week with the replacement MCU. These things are not cheap and I am concerned this will happen again. I am worried about taking my MS on a log trip for fear that the MCU is going to fail again. I am wondering if the MCU's are typically this unreliable? Also, is it normal to have to reboot the MCU very often? Just today we were driving and listening to streaming music. Suddenly the music turned to just digital noise and the AC and other controls became unresponsive. The the navigation screen froze up as well. I am really worried this will continue to be an issue. I am becoming very insecure about the reliability of the MS when they start getting some age on them. Is the MCU problem an ongoing issue with these cars?