If you have on iOS 12.1.1, and your Hub (Plus) is always offline? No worry, we are working on it.
The fix is on SwitchBot App 2.8.8. We have done all the work by now, and now it is under Apple's urgent review.
Android users are not affected. iOS users on 12.1.0 and before are not affected.
Please also make sure your App is always up to date.
If any further query, don't hesitate to contact firstname.lastname@example.org.
Some recent changes in iOS 12.1.1 official release (released on December 5th) affected some services used in SwitchBot App, and around 85% of our iOS users.
We brought new UI design on 2.8.6 (released in late November), including easier recognization of online and offline status. We further brought improvements on 2.8.7 (released on December 12th) to shorten the delay in the online status change. Both changes made the symptom of Hub (Plus) offline "looks" worse.
We made updates in SwitchBot App to adapt changes in iOS 12.1.1, it works well in our recent tests.