@GameZone,
The BT has different reactions on the MG4.
When you Idevice is set, normally everything must go on. But sometimes, not.
I have this look on mine, (Trophy R46 first one R46 version, shortcut wrong on the left star).
Every time I go in, the BT is Synch & my music works fine. But sometimes, there is no sound, so I pump up the volume with the right joystick on the steering wheel.
But sometimes no sound at all, Wow, what happens ?!?
On the main display you have two arrows, select one of them to move from radio to BT to Amazon and go back to BT. Most of the time your sound will be back.
Most of the time my idevice plays music alone, sometime I have to run the app first and the sound goes on.
Most of people think BT is wrong, but not.
Check what you do before your what to run your music.
There is a special update 4 BT
Labougie