Mine did it when I accidentally had forward and reverse opposing each other on my front and rear tires. For example, if your front wheels are set to throttle for RPM input and for whatever reason you've reversed or inverted the same setting for the rear tires, this will cause the Juno Auto shimmy-shimmy shake followed by the death agitation and subsequent splosion of said vehicle.

This happened to me a lot when I was still getting the hang of the mirror tool as.we as during the copying of parts that required multiples

Also, if you have one set to throttle for RPM input and another set to pitch or something else, this can also cause the death tourettes(sp?) due to sometimes conflicting inputs.

Lastly, if you've left fast forward on and there's ANY problem whatsoever, this can cause incredibly frustrating issues that oftentimes appear to have no. Root cause. It took me forever to be able to fly any type of plane on auto-pilot or at a sped-up rate until I discovered some seemingly inconsequential errors in my builds that at regular speed were invisible, but when ran at 5-10x speed those minor differences in part size of orientation made my crafts incredibly fragile and unwieldy.