Hey, it may be that he sustained a head injury during one or more of the falls he's taken. Do you ever recall him being motionless after a fall or having a shaking ( seizure ) episode after any of his previous falls? Sorry but falls from heights are a potentially serious and crippling type of injury for any animal. I think you should take his incoordination as a possible result from repeated falls at significant heights as serious. Maybe he suffered a concussion that went undetected for years and now he's presenting with suspicious lack of coordination secondary to head trauma?