Monroe County Community Credit Union issued the following announcement on Sept 23.
Some members have reported seeing a 'Change Password' notification pop up on Chrome--this feature is triggered when Google has identified a problem with a password in one of three categories: passwords you've used more than once, passwords that have appeared in data breaches leaked online, and passwords that aren't strong enough. If you have this alert system turned on, it monitors all passwords for potential problems. Make sure you're regularly changing your passwords and (as hard as this can be sometimes!) don't reuse passwords across multiple sites.
Original source can be found here.