I have Edge 530 and during an activity i connect it to Forerunner 735XT for heart rate (broadcasting hr function).
It works, till i stop Edge for some time, Edge probably goes to sleep after a while, and when i turn it on again, it cannot connect nor find Forerunner Ant+ sensor (tried many options/times to find/connect again, nothing worked). I've experienced this 2 times.
The only way was to pause activity, TURN OFF the Edge, and turn it on again (Forerunner was found again), and continue activity.
Edge 530 Software is up to date — Version 4.10.0.0
735XT Software is up to date — Version 9.40.0.0