iDrive minimum volume after engine startup(E87 130i)

[saza]

Hello.

My E87 130i has problem.
I'm not good at English.
I write simply (use Google Translate).

After the engine startup(when the BMW logo appears on the display), iDrive volume is minimized (the mute symbol isn't displayed).
Occurs in all modes. (radio, CD, AUX)
The dial is alive and can increase the volume.
I restarted iDrive, but nothing changed. (2eject and volume)

I got this car a week ago.
The battery was replaced with a genuine Bosch product.
I don't know the previous state.

help me.
Best regards.

[shogun]

please use google translate from Japanese to English, here the translation: Hello.
There is a problem with the E87 130i. I'm not good at English. I write easily (use Google Translate).
After the engine starts (when the BMW logo appears on the display), the iDrive volume is minimized (the mute symbol is not displayed). Occurs in all modes. (Radio, CD, AUX).The dial is active and can be turned up.
iDrive restarted, but nothing changed. (2 eject and volume)
I got this car a week ago. I am replacing the battery with a genuine BOSCH product. I do not know the previous state.
help me.
Thanking you in advance.

[saza]

すみません、ありがとうございます

I'm sorry, thank you