New iphone 6 keeps asking for icloud password after restore from backup.

Hello there, dom5031.

The following Knowledge Base article offers up some great information for troubleshooting iCloud accounts:

iCloud: Account troubleshooting

http://support.apple.com/kb/TS3988

Particularly useful is the following information. You might also want to try logging out and then back in when performing these steps:

Initial troubleshooting steps

1. Check System Status to make sure there are no outages or scheduled maintenances currently affecting your iCloud account. System Status is available from the iCloud Support website.
2. Update your computer or device to the latest software version. See iCloud system requirements for more information.
3. Ensure that you are logged in to iCloud with your Apple ID on your iOS device, Mac, or PC:

   iOS 5 or later:

   1. Tap Settings > iCloud.
   2. Review the iCloud settings to make sure the account is set up properly.

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.