I just don't think the repeat missions bug exists. Other posters have convinced me that if you complete the mission and radio in you will have the same experience I have. I very seldom get a repeat mission. I have had six missions in my present career and probably eight in previous careers which were cut short by mod changes that I couldn't resist.
Do what you're told. Radio in when the star turns gray. Missions are truly random. Random choice guarantees some repeats. It works!
