what is wrong with my Mt. Bike rear Derailleur?

Michael

New member
when I am pedalling my bike, all is well, but when I pause from pedaling, the bottom Cog? on the rear derailleur shoots forward, sticking into place, and then the chain droops and falls off.
Oh it is called the JOCKEY that moves forward and sticks, before the chain just drops loose.

Thanks for video, but that is not the problem.
 
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