Sometimes it shows a day (or days) "flatline" for some reason, even though activity was consistent each day. ??
Sometimes it shows random timeframes for a day. For example, it usually shows a day beginning in the morning and ending in the evening. But sometimes it will show a day as beginning sometime in the afternoon. ?? Again, even though each day has been substantially identical - say during a work week - some days are shown merely hours long, and that activity is just lost I guess. The phones health app captures the activity, though, so who knows why this app takes leaves of absence like that?