Lately Gmail keeps asking me to change my password because it thinks my login patterns are suspicious. I've probably changed my password 10 times now, and the worst part is I can't re-use old ones, making it harder to remember my login.
The workaround it seems is to actually ignore the change password request if you get it and clear cookies in your browser based on the support thread here:
https://support.google.com/accounts/thread/73279572/my-gmail-account-kept-asking-me-to-change-my-password-every-time?hl=en