Until we see a video, in the meantime, you want to check and make sure he isn't having some sort of pain issue.
When is the last time Scooter saw an equine dentist, if ever?
Has he ever been checked by the chiropractor?
When is the last time he had a complete health evaluation with a vet?
Are you sure your saddle and tack fits well?
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.