Try this as it has worked just fine with me :
I was facing the same exact problem, especially due to where I live the average temperature during the summer season is around 120 F.
So what I did is as follow :
-Make sure the SYNC button is off.
-in the idrive setting menu untick the rear ac option.
And this should do it as it has work just fine with my vehicle.
Hope it will help.
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