Musk’s net worth fell almost 4% as of midday Tuesday, dropping to almost exactly $100 billion below his all-time high of $464 billion.

Elon Musk, once the face of Tesla’s meteoric rise, seems to be turning his focus elsewhere just as the company faces mounting challenges. With Tesla’s sales slipping and competition heating up, investors and analysts are beginning to question whether Musk still has the passion — or the time — to lead the electric carmaker.