Hi sunbird010,
Welcome to Microsoft Community. Let me assist you with your account that keeps getting blocked.
Microsoft blocks accounts if they detect any suspicious activity on the account. This is to ensure that the accounts will not be used in case hackers were able to access the account. This is to protect the files that you have on your account as well.
You can refer to this link for information on how to secure your account.
Feel free to ask if you have further questions.
Thank you.
Johan