Tesla Inc. (Nasdaq: TSLA) temporarily halted some production at its car-assembly plant in California because of problems with its supply chain, though work has begun to resume, Chief Executive Officer Elon Musk told employees in an email. Backlogs at ports and severe snow storms affecting ground transport have caused some of the supply-chain issues, according to a person familiar with the matter. Also, the latest investment in Bitcoin at relatively high prices has created a positive correlation with bitcoin prices adding a new headache to investors.