This isn't at all surprising...
The Europeans and some other brands have been having a small handful of issues with the "Bulletproof" (according to one article in Popular Mechanics I smirked at a while back) 7spd ZF transmissions they used in everything a few years back. Now they started shoving 8 & 9spd units in their vehicles and lo and be hold they start having issues...
Like I said before, a lot of times there's more gears than the vehicle knows what to do with and cramming that many gears in such a small package has led to a sharp downturn in reliability. Not that 7+ speed transmissions are inherently bad, it's just that apparently shoving in 2 or more extra gearsets into the same package is going to require better tuning from an engineering and software perspective. Jeep has been the most notorious with issues, their attempts at a 9spd unit in their vehicles has been most noteworthy in terms of how often they fail or have issues. Toyota has been sticking with what works vs. trying to push the envelope too far. Look at the fact that most of the "new" 6spd transmissions in the newer Toyotas have be derived or pulled from Lexus vehicles (typically Toyota's "higher end/cutting edge" technology shows up in Lexus and trickles back down to Toyota.)
As for the Tesla dipping in reliability, that doesn't surprise me at all. Those things are on the cutting edge and I'm hearing from techs at the factory that they have issues before they leave the assembly line. But the key thing to remember here is that the Tesla is not so much a "car" as say a Corolla or Camry; but it is more a "commodity" like a Cellphone or Laptop. They are so technologically advanced and centered that their core components are constantly change at a rate that most manufacturers wouldn't dare attempt (they literally are cooking up new batteries for these vehicles and just shipping them from R&D to the Assembly Line as they go.)
The best part? Who cares for the most part if a Tesla isn't "reliable?" Because most of them are under warranty or being leased, and so far Tesla has been extremely good at supporting their customer base through the growing pains of pushing the technological envelope. So I say, don't buy a Tesla, lease one; these guys will get the reliability, efficiency, and details down pat in less than a decade. By that time the infrastructure will have caught up and they'll give everyone else a run for their money on affordable, efficient, and reliable Electric Vehicles. Elon Musk is basically a supervillan mad genius who has planned all the moves for the next few years.
