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Did you spill something on it? Try soaking a cloth in hot water and placing it over the HUD button for a few minutes. Hopefully the steam will...
I believe the range can also be impacted by the use of the climate control (just turning it on will probably drop the range) as well as the...
Try deleting the pairing between the phone and in-car system and then re-pair them. That should do the trick.
Did you just upgrade to iOS7? If so, that could be the issue. Is the car adapter third-party? If so, Apple may be blocking it. Annoying to have to...