HMM: Tesla paused Model 3 production for planned upgrade in February.

The company did not provide specifics about the production upgrade, but it said there could be more periods of downtime in coming months.

Last month, Tesla said in a shareholder note that it continues to target weekly Model 3 production rates of 2,500 by the end of the first quarter and 5,000 by the end of the second quarter.

The company, however, said in the note that while it has plans to achieve those goals, “our prior experience on the Model 3 ramp has demonstrated the difficulty of accurately forecasting specific production rates at specific points in time.”

That’s not very reassuring.