Thanks for visiting the Apple Support Communities. Sounds like you had an issue with your Apple ID. Great job resetting your password. This article has more things to check to help you with your security: If you think your Apple ID has been compromised - Apple Support
Are you using two-factor authentication? If you are, verify the devices that are logged in (from the article above) and ensure your trusted devices and number are all current and valid. If you aren't using two-factor, you may consider adding this level of security. This article talks about two-factor: Two-factor authentication for Apple ID - Apple Support