310xt has software version 4.50 running on Macbook Air with software OS X 10.9.4 with Garmin Express software version 3.2.18.0.
It was syncing just fine in mid July, but the last several weeks I've tried all the "solutions" posted in Threads to reset Forerunner and reinstall Garmin Express. Each time, it recognizes the Forerunner and goes into Transferring Data, but after about 15 seconds, the Forerunner goes back to normal screen and Garmin Express freezes on Syncing... <1 minute remaining...
Please help!