Gmail has been giving me this message a lot more frequently.
This has happened simply because I delete a particular email, or tried to add a Label to another or simply click an email to open it.
It certainly unusual activity but by seem to be created by Gmail itself.
Is anyone else experiencing this as well ?
Account Lockdown: Unusual Activity Detected
This account has been locked down due to unusual account activity. It may take up to 24 hours for you to regain access.
Unusual account activity includes, but is not limited to:
1. Receiving, deleting, or downloading large amounts of mail via POP in a short period of time.
2. Sending a large number of undeliverable messages (messages that bounce back).
3. Using file-sharing or file-storage software, browser extensions, or third party software that automatically logs in to your account.
4. Leaving multiple instances of your Gmail account open.
5. Browser-related issues. Please note that if you find your browser continually reloading while attempting to access your Inbox, it’s probably a browser issue, and it may be necessary to clear your browser’s cache and cookies.