Next slot not found?

It just randomly decides to stop a car whenever I use smart exits (on defect mode) or the “defects fixer” thing. It won’t move on no matter what I try. I am doing freeplay all tech, and can show a pic if asked. It ruined my many hour save.

Happened similar stuff with my brother, he said he mailed the support directly and waiting for a response.

just an update he got retrive back for support after 5 working days.
He wrote details about solution over these two blogs: tutuapp showbox