I am having the same problem as you, so far I only found this problem every time I attack Geonosis.
As far as I know there is a limit of maps that you can put on conquest mode. If you use too many the game crashes. I think 30 planets is the max that it can support without crashing. But I am worried about Geonosis because is a vanilla map of the game and I don't know if a map of the actual game can be removed like mod maps.
RainPain478
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