Race S not saving activity

[boogi33]

Hi!
I own a Race S since a few months, so far very happy with the watch (first fitness watch) aside from minor glitches. Usually I am not wearing the watch every day, only during longer activities. I wore the watch regularly for the last few days. I was not tracking a specific workout but the watch of course tracked steps/ calories etc. The watch synced the data with the Suunto app in the evenings. However, next morning, all activity data is gone from the app. Only the current day is showing, nothing from the past days.

Watch and app are up to date. Reinstalling the app did not help. Restarted the watch, no changes.

Any advice on what to do?

Thank you!