Robo-Hunter: Verdus by John Wagner
Sam Slade used to be one of the best robo-hunters in the business. But he's getting old, and old means slow, which means dead! That is, until Sam takes on the biggest case of his life. Verdus was a paradise planet. And while colonists made their long journey there, a self-replicating robot was sent out to prepare the planet. Since the humans arrived, all contact with the colony has been lost. But the light-speed journey to Verdus has been sabotaged, and relativistic effects have made Slade a much younger man. Now his trouble's just starting in this classic adventure by John Wagner (Judge Dredd) and Ian Gibson (Halo Jones).