A tip for anyone struggling with the Bluetooth connection between their Garmin Enduro 3 and headphones.
I had issues for months on my Gramin Enduro 3 with the headphones breaking up, not connecting, and disconnecting during runs. I even logged a call with my local Garmin and they replaced with a new one. The issues persisted.
The one day I came across the power settings on the activity and it changed everything. If you have issues, go onto your running activity > Run settings >Power Mode > Default Mode > Choose "Max Accuracy".
Since I changed that setting my Headphones have not broken up once, I haven't had any issues connecting my headphones, and they haven't disconnected during a run once. For those worried about the battery life on this setting, I still get 1.5 weeks of +-40-50km per week out of the watch with using the headphones. And I wear my watch day in day out with the heart rate monitor activated.
The Enduro 3 has finally turned into the watch of my dreams!