As he slowly recovered from his heart attack and stroke, Wagner manifested unusual symptoms, including difficulty walking and concentrating, loss of balance, and symptoms of dementia, threatening his music career and his life. In 2011, Wagner was diagnosed with normal pressure hydrocephalus (NPH), a type of dementia which affects, among other things, fine motor skills and gait. In late 2011, after successful surgery at Barrow Neurological Hospital in Phoenix, Arizona, Wagner was able to make a significant recovery, regaining almost all of the dexterity which had been lost over the course of the disorder's progression.