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Watch the voltage on the dash during longer drives. Do you occasionally find your system dropping close to or below 12v? I had a bad chassis ground that caused intermittent strained & failed hot starts due to irregular resistance when the car was hot. If I had a sound system before that was fixed, I would've expected to hear whine or other noise skipping off of the charging system as the battery ran low. It was bad enough that it started shorting my instrument cluster.
Once the car cooled down, resistance went back to normal and charging system worked as expected again without noise. If you find your voltage isn't consistent on 1-2 hour drives and there are random low points, take your car to the dealer (covered under powertrain because of lack of starting) and get them to identify which ground is faulty so they can replace it.
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