I can listen to music all day, but as soon as i hit the start button to select an activity the headphones will shut down.
They do not loose connection, they shut off as if i intentionally shut them down by long-pressing the power-button.
The headphones are "Jabra Elite Active".
Firmware of Forerunner 945 is 2.40.
Update: The activity screen will also kill the bluetooth connection between my smartphone and the headphones.
As long as i am on the activity-screen my headphones will constantly shut off and reconnect to my smartphone.
Completely removing the headphones from the watch does not help. The watch will still kill the bluetooh connection from phone to headphones.
Update 2: I put the watch into HR broadcasting and this again killed all connectivity to the headphones.
Therefore i have to conclude that these headphones are not properly dealing with "interference" (or whatever) from ANT+ signals.
Unfortunately this probably means there is no possibility to fix this.
greetings
schmolch