If your iPhone keeps asking for your email password, it's likely because the device is having trouble syncing with your email server. This could be due to a range of causes, including incorrect login information, server errors, or outdated software. To fix the issue, you can try a few different solutions:
1. Check your login information: Make sure you've entered your email and password correctly. If you've recently changed your password, you may need to update the information on your iPhone.
2. Update your software: Make sure your iPhone and email app are running the latest version of iOS and the latest version of the app. This can help ensure compatibility with your email server.
3. Reset your email settings: If all else fails, you can try resetting your email settings on your iPhone. This will erase your existing email account information and allow you to start fresh with a new setup. To do this, go to Settings > Accounts & Passwords > Add Account, and follow the prompts to set up your email account again.
By following these steps, you should be able to resolve any issues with your iPhone asking for your email password repeatedly. If the problem persists, however, you may need to contact your email provider or Apple support for additional assistance.