I got the Air and Sky 3-4 weeks ago. Both units gets offline intermittently daily.
Before the V94 update both Air and Sky has a much longer offline time. It is shorter now but it is still occurring at least once daily.
It is clearly visible from Weather Underground here https://www.wunderground.com/personal-weather-station/dashboard?ID=IAUKHUAP4
You can see the Sky and Air units goes offline at separate times.
Station ID 4903
The usual restart of the Sky and Air unit plus moving the units around will not help.
The one thing that I have not tried is resetting the Hub. Any other things to try before I do that?