I think the keyword here is “suddenly”.
This happens to me too, on a semi regular basis.
Cosmos browser works fine for hours, then suddenly I get the “There is a problem with Chaos Cosmos” msg with the “reload” button. Reload > window goes blank.
Sometimes it comes back after 30 min or the next morning.
Happened this morning, Aug. 19, at 11:10 am EST/ UTC -5
At 1:12 pm EST Cosmos loaded normally again. (maybe check your server logs)
It feels like the Cosmos server is overwhelmed and goes dark every now and then.
If this is licence related wouldn’t this also impact rendering? I can render just fine while Cosmos is not accessible.
I have a very stable & fast internet connection, no AV, no firewall blocking.
MacOs 10.15.7 / Cor V8 HF1