It may not be the telephone control unit. That was just an example in my Dad's case. The root problem is likely that some component on the MOST bus is causing the entertainment system to crash. The dealer is your best option, because diagnosis is pretty tricky. I assume that if you have a 2007 X5 with only 4,200 miles that it is still under warranty.
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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input
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