I found that mine does that on occasion (both iPhone 5s and 6 either via cable or EBT). I've only ever had IOS 8+ since owning my car, so I can't compared to previous IOS versions. Some have said it's an IOS compatibility issue. The recent update didn't fix the issue.
If I close my apps and reboot my phone, it fixes the problem. Have not been able to pin point what causes it.
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