Mo-banking password expires every 3 months hence, you need to reset your password in every 3 months to not to get expiry information which will also save you from blocking your password.

However, if your password got expired, you need to reset your password. But if you tried with old password for many times, your password will be blocked, for which you need to visit your respective branch to inform the same and need to fill & submit the unblock request form to the branch.