Hello, I've the same problem... however my sound is likely there when I restart the X5 after an hour or so, but it is as likely to disappear during the minutes that follow, often when the car is shaken.
There is then a fair chance to get sound back as soon I drop the phone after a phone call (but it does not always work).
--> My guess is that it is the line of the Phone "mute" signal that brings every sound source down thru a bad contact or so.
BMW wanted to replace the radio for 900 €. Hmm a lot of money for a bad conatct if my guess is right.
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Most sat nav/radio issues are caused by a flat battery! The most simple solution to try is th switch the vehicle off, go to the fuse box on the right hand panel of the boot (as your facing boot) remove fuse 24 (5 amp) for 5 minutes then replace and start vehicle as normal! This will reset the nav/stereo system! Rich B
have a x5 4.8is the on the left hand side i heard a a knocking noise under the car round the passenger footwell then when i parked in up ten minutes later the whol front end has dropped and back is ok..it has air suspension.. but explain the banging before it dropped..