There is something going on with him, and he is not acting normal. Something has affected his decision-making abilities and if I were an investor (I'm not but I'm a Tesla-owner) I would be very worried.
https://www.nytimes.com/2018/07/18/business/elon-musk-vern-u...
Aside from all the unusual things that have been happening of late with his public Twittosphere and the like [1], there might also be the question of whether his personal life is affecting his professional life [2] in addition to that NY Times interview where he reportedly admitted to writing the "Funding secured" tweet while driving to the airport, and also needing Ambien (zolpidem) to sleep.[3]
Now just to apply a skeptic's hat for a moment; assuming that there is anything false in these reports of late, one would be expecting lawsuits being launched by Musk over slander or libel. The weeks ahead are going to be interesting either way.
[1] https://www.vox.com/2018/8/16/17692700/azealia-banks-elon-mu...
[2] https://www.businessinsider.com.au/who-is-amber-heard-dating...
[3] https://www.nytimes.com/2018/08/16/business/elon-musk-interv...