Hey there Joeyjoss19,
Are you able to test for the same behavior when using a different Bluetooth headset? This would be helpful to isolate the cause to either the Bose headset or your iPhone.
You may want to unpair your Bose headset, then pair it again, following: Pair a third-party Bluetooth accessory with your iPhone or iPad
Unpair a Bluetooth accessory
To unpair a Bluetooth accessory, go to Settings > Bluetooth, find the device you want to unpair, and tap the More Info button
, then Forget this Device. This removes the accessory from the list of available Bluetooth devices.
To add the Bluetooth accessory to your device again, place it back in discovery mode and repeat the steps to pair your device.
It may also be necessary for you to consult with Bose support for steps to troubleshoot your headset.
Bose Support - Contact Us | Bose
Have a good one!