Thank you for your reply. It does seem highly unlikely that someone would hack my account simply to put an entire folder into snooze mode. Surely they would use it to send malicious or phishing emails.
Having got a folder in snooze mode, is there no way of taking it out of it, other than one email at a time? How can I see how long it is going to snooze for?
It does seem to me that this function can create more problems than it solves.