Why does it want me to reset my password every time I want to go to app store

Presumably you have changed it once already?

What to do after you change your Apple ID email address or password - https://support.apple.com/HT204071 - After you change your Apple ID email address or password, you might need to update your sign-in information with any Apple services you're using.

Apple ID is locked or disabled

If necessary, contact iTunes Support. Scroll to the bottom of the page in the 2nd link.

iTunes Support

iTunes Support – world wide

What do you mean? Does it tell you the account is disabled? If it tells you that only when you try to download an app then you need to contact iTunes support because you may have a billing issue.