i did a hard reset by disconnecting the negative lead on the battery left it for about hour. now my xf r-sport wont respond to either smart keys not even the central locking. when i try to start my car i get an invalid smart key response on the dash. i have had the keys checked and there working fine. also unable to pair a new key to car message says failed. only had car about 3 weeks does anyone have any ideas whats going on ?