I've had these sort of troubles when building autobombs with the space docks on FRD mode, for some reason, the autobombs fly off into a region where they normally would have reduced speed, but continue to go on with their normal speed. However, once they attempt to change direction, they are suddenly affected by the speed slowing.
This happens especially when an enemy comes from outside the normally travelable bounds of the world (like marauders) and the autobombs immediately rush towards the marauders and are stuck. The same happens with hive golem wasps.