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I've noticed issues where the audio level intermittently drops.

When playing audio the volume will intermittently drop off (doesn't stop just gets quieter) then after some period of time it will return to normal volume.

This happens consistently when using CarPlay (plugged in via lightning connector) or on car Bluetooth.

The same issue happens on Bluetooth headphones. This issue didn't appear until after iOS 11, but has been going on ever since then despite several updates since then.

This issue first appeared on my iPhone 7 after the iOS 11 updates. Now I've just upgraded to an iPhone 8 Plus and it is having the same issues straight out of the box.

This is a problem across the phone itself, but for some reason is more noticeable in some situations than others.

For example; this issue occurs with Apple's "Music" app, but the volume change isn't as drastic as with the "Amazon Music" app.

When plugged in with a pair of lightning headphones this issue doesn't happen, but when using bluetooth or carplay (even using usb/lightning adapter) it constantly drops in and out.

  • @fsb I've updated the question. This issue is not tied to the Amazon app; rather that is just the app I use most for listening to music. I've tested it with Apple Music and Audible which both have the same issue. If there is something else I can/should do to make the question a better fit I'm happy to do so provided some direction on how to do so. Unfortunately, this is an ongoing issue with iOS for over a year now that other users have encountered, but until now no one seems to have a solution for it. – bigtunacan Mar 8 '18 at 17:36
  • The way it was originally written made it appear to be about the Amazon app only. Your updates will help, thanks. – fsb Mar 8 '18 at 17:59
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Are you receiving texts, notification, etc when the volume drops? Most bluetooth interfaces will dim the volume when a notification arrives, even if the notification sound is set very low. Check your notification setting on the bluetooth device by adjusting the volume without any music playing.

Try using your phone in silent mode and see if the problem goes away.

  • Christian, Thanks. It appears this is the issue. It's a bit odd as sometimes it's unclear what the notification is as I won't see an alert or anything, but during the volume drops I hit the volume to check and the phone has switched to "notification volume". Apparently, this a "feature" of iOS, albeit not one I'm a fan of. – bigtunacan Apr 4 '18 at 20:57
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My 7+ has the same issue, and what I have tried is to turn off all notification sounds, so the banner will still pop up, but with no sound to interfere with the Bluetooth volume. I believe this issue came about because later phone versions allow different sound volume settings for different functions, and the nannies at Apple don't want you to accidentally blowout your ear drum from the headset going full blast when you get a text or something, because you could sue them for that.

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