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As title says, check the world list; about 30 worlds are going between online and offline every 10 seconds or so.
External link →As title says, check the world list; about 30 worlds are going between online and offline every 10 seconds or so.
External link →Status: We're investigating this at the moment.
update:
It doesn't seem to interrupt play once you're connected to a world, but may cause a bit of difficulty seeing the other worlds and changing to them Additionally it might also make communication across worlds difficult (e.g. Grand Exchange)
We're working on resolving this.