I would bet it is related to the mismanagement of the German automation plant that Tesla acquired about a year ago (on mobile, too hard to post links, maybe someone wants to help).

The plan as I understand it was to use the technology at this company to speed up production but it hasn't been going as planned, in large part due to misunderstanding of cultural differences i.e. No one is going to be happy here in Germany if you start changing the terms of contracts that were supposed to last for the next few years and people in general don't respect abusive bosses. Unemployment rate is 3%, no need to (and lower for highly skilled workers). And you can't just tell people to not take vacation because production is behind, you'll get laughed at.