Two days ago Strife got exactly the same message ...Your account has been blocked
Why are you seeing this?
Someone may have used....'
Fortunately she had the alternate email address - but this message showed up after she'd logged off at her home computer and less than 30 minutes later tried to log in from another computer.
Relogging in it seemed that some mails had been lost yet logging in later in the day - all the mails were back again.
Weird internets.