As of Friday my Galaxy 3 42mm non-LTE has started acting sluggish, taking longer than usual to load apps, especially Spotify.
And the biggest problem is its completely stopped measuring the sleep stages. It's asking every night if I've slept manually. The hours are accurate, just no stages. It was fine previously.
I've factory reset the watch which didn't work. There's a thread on here about a "sleep widget" but that seems like something for an older version of the watch since I don't see any such widget for this watch anywhere including the Galaxy store.
Figured it out for now. It didn't seem to be a problem with the watch. I uninstalled & reinstalled the Samsung Health app which seemed to fix it. Now I'm getting the stages again and other data that wasn't syncing properly but I didn't notice.
Don't know how it got corrupted but ok. At least it's working for now.