"The current crisis at Tesla puts into sharp focus the long-term problems at the company stemming from the CEO's absence, which is amplified by a Board that appears largely uninterested and unwilling to act in the best interest of all Tesla shareholders by demanding Mr. Musk's full-time attention on Tesla," the letter said. It added, "Tesla's stock price volatility, declining sales, as well as disconcerting reports regarding the company's human rights practices, and a plummeting global reputation are cause for serious concern."