The same problem re-emerged less than a week after getting the car back last time. Took it back in and the service department has had it for over a month at this point. They got a Nissan Corporate Engineer to help troubleshoot, and were able to replicate the problem. They replaced a different component, tested, and found that replacement also did not solve the problem. They have now installed a new "harness", and say that they will complete another test to see if it fixed the problem tomorrow.
(The dealership has provided a loaner to me for over a month at no cost. As far as I can tell the dealership and Nissan are doing their best to repair, but I am not all that confident they will be able to.)
Meanwhile, I pursued lemon law action with Nissan Consumer Affairs. They have made me an offer to repurchase the vehicle. They repay to me what I already paid for the car (down payment plus monthly payments) LESS a "usage fee" (which in my case is just over $1,700 for the ~8k miles I put on the car in the 6 months preceding when I first brought it in for this problem), and LESS the gap insurance fee and theft deterrent device that the dealership forced me to have installed. I can apparently get the gap insurance fee back, as I'll just have to cancel the insurance, but it looks unlikely that the dealership is willing to refund the $1k I spent on the theft deterrent device. Also, if I sell it back to Nissan, I have to re-pay my $2,500 California State rebate back to the state.
So now I will likely be looking to take the buyback option and go find a different EV. Looking at either a new Hyundai Ioniq EV (just came out, has 17 miles more EPA range than the Leaf, at 124) or a used Toyota Rav4EV. Upside for the Used Rav4 is that it is longer range and more interior volume, likely greater utility. Downside is the uncertainty regarding getting decent service on the Rav4EV if things go wrong. Even if I get an extended warranty from Toyota, from what I hear it's hard to find dealerships with techs trained to work on the vehicle, and even if you do their time may be limited.
2014 Leaf S with Charger Package (Blue Ocean)
Purchased 4/25/2014, Totaled (hit from behind on freeway) 9/20/2016
2016 Leaf SV (Glacier White)