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When the system does not find any frontiers reachable from the pose of the robot, it switches to inner exploration mode, which requests the robot trajectory from hector_trajectory_server. It then tries to go to locations in the map that are far away from the trajectory of the robot (e.g. go to places not visited yet). Switching into inner exploration really shouldn´t happen at startup though, so something is going wrong. Can you provide a screenshot of the situation (e.g. map and robot pose visible) by editing your post? Won´t be able to make any changes before Xmas though, as DRC Trials are looming ;)