Our last cocker, Sophie, was brilliant at playing with a ball. She would bring it back to you again and again until she was exhausted, even better for her was if she couldn't see where it had landed and she had to 'find it', she would search & search until she found it.
Ellie loves balls. She will bark & bark at you to throw it, fly after it, find it and then lie down next to it barking. You then go to her to get the ball to throw again and just as you bend down to pick it up she runs off with it, puts it down somewhere else and barks at you. No way can we get her to bring it back. It is a shame, you can really tire them out when they bring something back to you.