After completing a swim and trying to download the data, the watch displays "data transfer" and Garmin Express says "sync complete". I go to Garmin Connect and view my data which is correctly posted. Then the Garmin Swim and Garmin Express continue to repeat this process of "data transfer" over and over again even though there is nothing left to transfer. The only way I could get it to stop was to go in the device settings and remove the garmin swim from garmin express.
Garmin Express v3.0.12.0
Garmin Swim v3.6.0