Emotions (and inability to control them) are the primary cause....mostly fear in its many manifestations trigger these responses. Vairāgya practice done to the level of madhyama is sufficient for such needs. The Zen Buddhist 'non-attachment' is another method, particularly that practiced by the samurai. As is the 'centering' of Aikido. Mastery of the emotions leads to mastery of the mind, which in turn brings mastery of the vehicle. When this is accomplished the Ego is subjugated, Maya is restrained, and the Atma regains control.