Have you updated to the hotfix? I think I took care of this issue in the hotfix build.
You may have to start a new game however for the changes to take effect.
"great writers are indecent people, they live unfairly, saving the best part for paper.
good human beings save the world, so that bastards like me can keep creating art, become immortal.
if you read this after I am dead it means I made it." ― Charles Bukowski
Think I've knocked out this issue. The fix will be included in 1.12.
The problem was with the AI creating vehicles without brands, thus screwing up all the stats and everything.
If you come across it again, let me know.
Thanks
"great writers are indecent people, they live unfairly, saving the best part for paper.
good human beings save the world, so that bastards like me can keep creating art, become immortal.
if you read this after I am dead it means I made it." ― Charles Bukowski