In the beginning of the game I had an explorer, pressed A and it dutifully went off searching for anomalies. I did not have a scout in service at the time but this didn't seem to bother my explorer. Midway through the game I get a message, Explorer XXX can not find anymore anomolies. I check the map and its only 1/2 uncovered and there is plenty of unexplored space within its range. What's up with this?