It starts to pull apart at the end. Perhaps it should be moving at about half that speed? Also, it seems too "plasticy-shiny" and, oddly, too tall. Perhaps the camera in Blender is set incorrectly. I'll take a look today.
Here is two seconds of shot four. I mean, here is the entire two seconds of shot four. Perhaps again it needs to be slowed?
Here are the changes to Robot 3 version 5:
And slowing Robot 4 version 3: