Any Idea why my meshes get more and more distortet? How can i fix this issue? Please Help!

Thanks for your reply!! It makes me really crazy! I didnt find any solution on the web and nobody that talk about the same problem… Here are more pictures and two video files. The point is also, that it react like a “virus”… i mean, so it expands to other Meshes more and more. The only thing works for a moment is to start the engine again. But after some Minutes it starts again. It really destroy my brain :-/ I hope so much to solved it… Months of works will loose if not…

Video Examples: