Been there, done that. 07 X5 for me. Been to dealer numerous times. Blamed it on everything from key fobs, to the bluetooth module (and subsequent non-BMW approved bluetooth blackberry,) to an "I do not know." Apparently now, they have a PUMA case open. I did have a 09 X5 Diesel for 4 weeks. I set the brightness to full when I got it, stayed at full brightness the whole 4 weeks. There is something in the programing or the CCC unit based on vintage of production.

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