I have a Garmin Edge 510. All worked well synching courses and activities through Garmin Express and Garmin connect app on my Android phone. It just stopped working Saturday morning 11-10-2014. We only use this feature on our Garmins to track our courses. error message is " error occurred synching to device"
Actions from my side:
1. downloaded and installed new Garmin Express
2. Reset android device to factory settings and started over downloaded updated version of garmin connect app Build Version 2.5.1
3. Reset Garmin Edge 510 to factory settings and started over