In the investors call last week Tesla stated that the problem is at the Gigafactory with battery production.

Here's a link to a summary of conference call: https://www.reddit.com/r/RealTesla/comments/7ao4m0/conferenc...

That forum is quite anti-Tesla (as opposed to /r/teslamotors). The whole Tesla thing is quite controversial - lots of haters, lots of fanboys.

Best advice I can give you: Read what both sides have to say and weigh the arguments. Then just stick with the truth you've always believed in - it's what everyone does in 2017 ;-)