I have noticed this morning Athletes other than me are missing on the Athletes page.
This is intermittent as I can see it while refreshing the page, and disappear again.
Also the Fitness/Fatigue.Form values do not match today’s values displayed in Fitness tab.
Could be timeouts. The client maintains a persistent connection to the server so the server can push changed activities and so on to the client as they happen. There is some logic to re-subscribe after a connection drop (laptop going to sleep, changing wifi etc.) that could be buggy.