Well I had my iPhone forget the Garmin vivosmart HR BT connection. Then I installed iOS 10.2. Then I had to run some errands, so I reconnected the iPhone with my Toyota RAV4 audio system. That worked well. Then later I reconnected my vivosmart HR to my iPhone as well. The iPhone still connected to the RAV4 audio system without any issues. I had to run several errands, so the car got started and stopped a few more times, and each time the iPhone and RAV4 connected properly without issues, and the iPhone and Garmin are also connecting without issues. No clue as to what was the issue, but it does seem to be gone with iOS 10.2, though that could just be pure coincidence. I too had convinced myself this was a Garmin BT issue, but it just might be that iOS 10.2 is able to adjust and correct for that issue.