I've had my car in twice for this issue. The first time they upgraded the firmware, the second time they replace an MC unit (I think that's what they called it). Still whenever the temperature gets below 30 degrees (usually around 25 degrees) at night, the next morning the infotainment system...
so we're driving along coming home from road trip listening to music and using the nav, when all of a sudden no more music, look over screens black...
after a second, its the blue sky background with mazda logo, then the audio screen is up saying 'audio off' in the middle
push the power button...