I had this issue, and samsung made me send it in for repairs. They replaced components, only to have the same issue when I got it back. I saw somoeone mentioned that you had to delete old data, so I totally wiped all my old data and everything was working again. I t worked for a week, and then noticed today everything dissapeared again. I again went into my data, and noticed that it autodetected a workout from my samsung galaxy buds, and the watch. When i deleted the galaxy buds workouts, everything came back. There must be a glitch with the two workouts conflicting, or just the galaxy buds workout is corrupting the file somehow. This is a bug and needs to be fixed, but maybe this solution will help someone else too.
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