I had the same issue. Check your connected sensors in settings. For some reason, I notices there were two connected sensors for the Jabra 65t active headphone, one for headphone and the other was connected as a power meter. After deleting the one showing as power meter, I no longer have the connection issue. My Jabra is correctly paired to two devices iPhone and the fenix 5 plus. Also, I noticed if you have it paired to two devices when I listen to music on the fenix and if my iPhone is not set to vibrate only, the iPhone will steal the connection from the fenix everytime a sound is played on the iPhone. Hope that helps.