Apple ID
My iPhone has been constantly asking me to put my Apple ID password in for 2 week. I changed the password to see if that helps. I signed out of the Apple ID and restarted the phone then resigned in.
many ideas why it keeps asking?
This may be your problem. Apple is aware of the problem, but there is no definitive solution yet.
Note that some have solved the problem by signing out of iCloud, restarting their devices, and signing back in.
In looking for something to help you, I suggest you use my search link https://www.google.com/search?client=safari&rls=en&q=update+apple+id+settings&ie=UTF-8&oe=UTF-8. You will see a number of links that are related to your problem. As indicated above, I have not seen a definitive solution for it though.
If you want to contact Apple Support to deal with your problem, see:
Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362
Apple ID Support https://support.apple.com/apple-id
Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169
Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best one.