Shares of Tesla Inc fell 8.05% on Tuesday, December 20, though Wall Street closed slightly higher after four straight sessions of losses. The stock closed at $137.80, just above its 52-week low of $137.66.

Tesla shares fell as at least three brokerages cut their price targets on the electric carmaker amid heightened concerns about weak demand and the risk of CEO Elon Musk being distracted on Twitter. The stock closed the previous session at $149.87.

Twitter is an apparent distraction for Musk. The sharp drop in the stock price also suggests that investors have lost faith in Musk’s ability to juggle all these concerns.

So far this year, Tesla Inc stock has had a negative return of more than 65%. At the same time, Musk announced that he would step down as CEO of Twitter after finding a replacement.

It was the first time Musk has mentioned his resignation as chief executive of the social media platform after the billionaire launched a poll on Sunday night in which Twitter users voted decisively for his resignation.

Musk admitted he had too much to do and said he would be looking for a Twitter CEO. But on Sunday, he said that without a successor, “nobody wants a job that really keeps Twitter alive.”