Bose Bluetooth Speakers Don't Connect Automatically Outgoing Phone Call
I own many bose devices such as a QC-35, soundlink, etc. When I connect them with Bluetooth and start a phone call on my iPhone 7+ w 11.4, the audio switches automatically to the Bose device. When I make a phone call with the Revolve (w. up to date firmware and I have factory initialized it a few times during troubleshooting and it is only connected/defined with my iphone), the output audio switches automatically back to the internal iphone speaker. I have to manually click the third option to send the output back to the revolve and it will switch back to the internal speaker a second time and I have to once again manually select the revolve. Once I hear the output on the revolve, it works as expected and does not switch again. BTW - interestingly, when it switches back to the internal iPhone speaker, if I let it ring and then connect, I will hear the connection 'beep' on the revolve, but the audio continues on the iphone unless I manually switch it. Also incoming calls work fine - I hit a button on the Bose and it connects and works as the headphones.
I also own a Bose Soundlink Mini bluetooth speaker which exhibits the same behavior.
I have already brought this up on the Bose support site and they were unable to recreate the problem. They said their iPhone 7 with a Bose Revolve works fine. I called Apple and he said the changes to 11.4 actually cause this behavior and it is 'expected behavior'. This of course conflicts with the BOSE support people who said it works fine.
So what is the scoop? Is this expected behavior? Are other people here experiencing the issue?
iPhone 7 Plus, iOS 7, 128 GB