Ok guys, just modify your vehicle construction files and watch the AI kick some major butt
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1. Do not let the AI build defense bases!!! I think that there is some sort of conflict between defense bases and colonizers, this conflict (when it appears) can cause the AI to get stuck on its build queue.
2. Avoid filling planets with stuff. This concerns especially weapon platforms as they take HUGE amounts of planets cargo space. I suggest not to build more than 1 weapon platform per planet. If you let the AI build all/almost all of it planets full of stuff it causes AI to get stuck on its build queue when it is building things that use up planetary cargo space.
After these changes i am pretty sure that the AI will never experience building problems, unless ofcourse its running out of resources...
Some time ago i was talking about changing construction.txt file so that all the AI states would use the same build list. I was using the default (malfadors) construction file. In this construction file there are defense base calls only in infrastructure AI state. When the AI changed its state to infrastructure state it sooner or later caused that conflict between colonizers and defense bases. This in turn caused the AI to stop its building...