Stop "reporting this to them multiple times" and sue them.

This is exactly why the civil legal system exists.

I promise you a consumer rights attorney will be interested in going after Toyota if you have clear evidence of it.

Or you could take it to an independent mechanic. It's likely just a bad connection to the "sharkfin".

> I realize these problems exist with all cars today.

Nah. It really doesn't, not to the same degree. Consumer Reports has demonstrated this handily for many, many years.