We have noticed this issue as well. One thing that helps is to make sure that it is sitting level.
Another question we have - if both teams plan to do the animal conservation mission - do they just discuss before the run so that dont collide with each other? If one team does the mission and then another, can the animals be changed by hand or must they be replaced by the robot itself?
Our model moved inconsistently sometimes faster than others. I did notice that there seems a speed that the robot needs to move the bar to get it to turn faster (not necessarily as quickly as possible). Also noticed that when I saw it moving slowly sometimes it was the result of the colored tray not being fully snapped together. Ours would start coming apart after a few times of use. Finally note from our experience that the biggest turns come when yellow bar it taken to it highest possible point.
Hope this helps.
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