There are several possible reasons why the App Store asks you to enter a password for free app downloads:
The Apple ID is linked to another account. In this case, the App Store may often ask for a password if you use an app linked to another person's Apple ID.
Problematic account settings. If you are constantly prompted to enter your password in the App Store, it may be due to your account settings.
Checking the security code. If this option is enabled, the password will be requested every time you make a purchase.
Unstable network connection. Unstable Wi-Fi can cause problems that cause the App Store to ask for a password.
To solve the problem, you can try the following:
Restart the iPhone. This may help to get rid of the error.
Update the software. Outdated software can cause various errors and bugs.
Change the App Store settings. To do this, go to Settings, click on your profile, select Media and Purchases, and click Password Settings. Then choose the appropriate option instead of "Always require".
Delete the corrupted applications. If the App Store continues to ask for the password after the app crashes, it must be deleted from the device.