Every time I’ve seen this the fix was clearing all cache/cookies in browser and flushing DNS on your OS over command line. I believe it happens when Cloudfront changes endpoints for the main Bubble app at bubble.is and your computer wants to load previously stored connections.
I’m calling this fixed. Sorry about the downtime… will post a postmortem to status.bubble.is later explaining what happened and how we’re fixing it down the line.
interesting to note that all the sites I checked to ascertain if it was only me When this originally reared its head, those which I know are on a dedicated plan were unaffected.