Cliff Robinson wishes he knew how to avoid it. He wishes there was a mechanical flaw he could adjust, or a physical or mental malfunction that he could rest or rectify.
  But it's been the same story throughout his 13-year career. The jump shot comes and goes on its own terms.
  "I have always gone through stretches where my shot doesn't go down," he said, before the Pistons played the Warriors here Wednesday. "But it always comes back. I don't know why it goes away or why it comes back. So I have learned that when it's not going, keep playing and don't worry about it. As long as you are getting the shots you are comfortable with, you will be all right."
  The Pistons are rooting for a rapid turnaround. On Wednesday, Robinson scored 12 points on 5-of-17 shooting. He made three of his last four. So, maybe.
  But in the six previous games, Robinson, the team's second-leading scorer, had made just 23 of 82 shots (28 percent). His scoring average in that span is 10.3, down from his season average of nearly 17 points a game.