Annoying automatic volume setting when connected with a bluetooth headphone

Hi chenqiang22,

Thank you for replying with more information.

To continue, please be sure that this device is classified as headphones in the Bluetooth settings of your iPhone. You may also want to check that the "Reduce Loud Sounds" feature is set as you would expect.

Click here to find more information about changing these two features: Use headphone audio level features on iPhone.

Cheers!

Hey chenqiang22,

Thanks for using Apple Support Communities. If you haven't already, check with Bose Support to see if there's an available firmware update for your headphones, especially since updating your iPhone. Here's a link to their support, just in case: Bose Product Support

In addition to checking for the firmware update, you could see if fresh connections help to resolve this by unpairing your headphones and setting them up again. Here's a great guide with both steps: Set up and use Bluetooth accessories on iPhone - Apple Support

"Unpair a Bluetooth device

Go to Settings  > Bluetooth, tap the information button  next to the name of the device, then tap Forget This Device.

If you don’t see the Devices list, make sure Bluetooth is turned on.

If you have AirPods and you tap Forget This Device, they’re automatically removed from other devices where you’re signed in with the same Apple ID."

To set them up again, follow the steps under "Pair a Bluetooth headphone, car kit, game controller, or other device" in that same guide.

Let us know how it goes.

Take care!

Hey chenqiang22,

We recommend reaching out to Apple Support directly for a closer look. You can reach them here:

Contact Apple Support

Take care!