Mine stopped syncing scorecards after July 4th. It has saved only one since out of over 20 rounds, on August 9th. I have connected and updated thru Garmin Express, and it sync fine with Garmin connect, just doesn't upload scorecards and then they are lost. I count on having this, and it has worked flawlessly for a couple years, but now I don't trust it.
Have had my S20 about 10 days. Played 6 rounds and all worked fine. Today scorecard wouldn't sync when using USB/Laptop. Finally figured out I did not save the score at the end of the round. Re-entered the score on my S20 manually-saved it and then hooked up to computer and all worked fine.
I’ve had mine a while now and I’ve been in touch with Garmin support multiple times. It never resolves the issue, it’s a design flaw in my opinion. Once you sync the data it delete the scorecard so in our case if you’ve just synced it and no card has appeared, it’s lost forever. I would say I’ve lost a good 15 rounds at least, which is a joke especially as Garmin don’t offer anything in terms of refunds, repairs or recalls etc. It’s a shame really as I love the watch features, I would get the s60 but I’m not paying that money for the same to happen to that.