SciFrog:

That’s exactly my point. Investors do not expect them to reach all the deadlines so why would they sell when the do miss them?

Companies are always punished by investors for missing deadlines.   Recall that equity valuation is based on free cash flow over future periods.   If that cash flow map changes, equity price is adjusted accordingly.  

Tesla has the additional problem of needing cash flow to service its burgeoning debt load, in part, made through its capital expenditures to bring the Model 3, and future products, to market.  If it can’t raise production, it will need to borrow capital, either expensive debt or dilutive equity, for solvency. Either cap raise will negatively impair current equity pricing.