My also went offline yesterday afternoon and had one of those not again moments.
I also checked and saw all the other BloomSky in my area working and showing current time.
I reset the device but it only posted data for a minute and then stopped posting.
To resolve it I shutdown my entire network, all routers and even the ObserverIP and Meteobridge.
After a full reset I was able to get the BloomSky posting data again and so far so good.