It has nothing to do with collision avoidance. At least that is after see my drones actually have collision avoidance problems when to asteroids spawned with in meters of each other I determined this is another matter. No they refuse to mine, they simply refuse to mine. They still do everything else they can do in terms of fleet orders. I have tried gently nudging them, Ive tried smacking them with the board flat side of my carrier. Ive tried clearing cache, reconnecting to the server, restarting the client. Reinstalling the client seems to be the only fix when they break, I assume there is something being stored on the client the 'clear cache' tool isn't clearing, just not sure what it is.