Once again I'm getting the "garmin servers are unavailable at this time" message when using 310xt with Garmin express. Have tried all the advice on the FAQ pages none of which works.
If the suggestions in the two FAQ articles below do not resolve your issue I suggest you contact Garmin Product Support by phone.
What can I try when my ANT Fitness device will not sync with Garmin Express?
https://support.garmin.com/support/searchSupport/case.faces?caseId={600f3dd0-3e6a-11dd-d7af-000000000000}
What should I do if I receive a server error while using Garmin Express?
https://support.garmin.com/support/searchSupport/case.faces?caseId={dd8e8b20-ef1e-11e2-7dd9-000000000000}