I have exactly the same problem with the same error message. Sometimes I also get this error message:
I also cannot login to FTP. On File Zilla the server allows the password to be sent but then it wont do anything else. Possibly server wide DDos attack?
If they are in Brighton with the server then maybe the weather knocked out the power again, they had issues earlier in the month with a power outage so maybe the wet weather warning issues last night is related… yellow rain warning
Has anyone received a reply from support about this?. My site has been down with a cloudfare error 521 since yesterday and no access to the file manager. I spent 5 days working on the site, customizing CSS Breezing forms, and many other parts of the site… now… NO access to nothing. It may be free, but if this is common then Its not encouraging me to pay for their service once im fully up and running with my sire right.