Hello,
This started happening 2 days ago after I had installed Garmin Express for my husband's garmin 520.
The first day I had both Garmin Express and ANT agent running in the background.
On the first day (Dec 23), ant agent started to transfer and said transfer failed.
I looked at my watch, in my activities and the run was gone!
I stopped running garmin express in the background (quit out of it)... then only used ant agent.
The next day it did successfully transfer my run but it deleted the activity out of history.
Same thing the next day.
I don't want to lose more runs. How do I stop it from deleting the activity????