Make sure your watch has the latest firmware, if problem is still there you could to reconnect the Coros enviroment to gps-speedsurfing.com (as described here -> https://github.com/djong1/gp3s/wiki/How-to-reconfigure-Coros---GP3S-Auto%E2%80%90Sync-Setup )
Please keep in mind Coros and GPS-Speedsurfing.com are running this free service on best-effort basis, the auto-sync is a complex connection procedure between the Coros Cloud enviremont and GPS-Speedsurfing.com services. A lot of issues can have impact on this, in these case the fallback procedure is to use the manual uploader (-> https://www.gps-speedsurfing.com/mygps.aspx?mnu=mytrackuploadv2 ) and make sure to use the track in .FIT extension (see Coros instructions)
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