Thanks for report. We are actively investigating this problem but please contact support if you haven’t already to we can make sure we understand your particular situation.
Also you should now be able to tell the difference between full hub reboot and a reconnection by looking at Last Booted in graph. This replaced Uptime which was very confusing because it wasn’t updated as frequently as you’d expect. If you still see Uptime then you just need to reboot your hub once or wait for it to reconnect on its own.