I have a MacBook running macOS Sierra which has been successfully connected to my Logitech Bluetooth audio device. Recently it stopped working. Specifically, in sys-prefs/sound it won't select the device. In other words, the Bluetooth connection is made, but it won't set as a sound device. I checked this with other Bluetooth sound devices from other manufacturers, so I believe it's a general Bluetooth audio issue.
Does anybody have any insight into this?