infotainment screen is off when i start car
 

I have 2016 CLS550.
Lately I have noticed that when I start up the car, the infotainment screen is off.
I have to manually press the infotainment power button for it to turn on.
It was not always like this; I have noticed this happening for the last 3 months or so.

In case it helps in diagnosing, when I shutdown the car the infotainment screen is always on.
When I shutdown the car the infotainment screen is either on Navigation or Media screen.
When I shutdown the car usually I have my Iphone plugged into via USB cable.

Does anyone have experience with this?
What can i do so the infotainment screen is on when i start the car?
Could it be a fuse issue?
Could it be a battery issues (main battery in engine bay and/or starter battery in trunk)?