The Silicon Valley luxury electric car maker previously warned of 10 days of temporary shutdowns this quarter as the company addresses manufacturing problems that have delayed volume production of the Model 3 sedan, which is seen as crucial to Tesla’s long term profitability.

Tesla has been struggling to find solutions to manufacturing bottlenecks on the new assembly line that produces the Model 3, a sedan intended for volume production. Chief Executive Officer Elon Musk has blamed an over-reliance on robots has complicated that task,

Musk, Tesla’s billionaire founder, told employees it was “quite likely” the company would reach a rate of 500 Model 3s per day this week, or 3,500 a week.  It needs to be making double that.  Musk also told staff to alert him of “any specific bottlenecks” on the production line.

The company shut down the Fremont assembly line last month, and also in February, for a few days to rework. The April shutdown, combined with the upcoming one, would add up to the planned ten days of stoppages.

Musk has said the planned stoppages are intended to give the company time to perform upgrades that will help it reach a goal of building 6,000 vehicles per week by the end of June. Musk last month said the company was producing 2,000 Model 3 cars a week.

Musk said last month that all Model 3 production would begin working around the clock. Reuters learned that the teams working on general assembly have already switched to three shifts, a schedule that helps maximise capacity and flexibility.