I've got a 2020 non-plus 40kWh with a failed cell.
We have a bit of an up-hill to our house. A couple days ago, I was driving home with 56% SOC. When we hit the incline, the SOC dropped like a rock, started giving low charge warnings, and went into turtle mode. That was all in the span of less than two miles at about 40-50 MPH. When I pulled into the driveway, just sitting in park, the SOC climbed back up to >50%.
I was able to repeat the issue on video. A day or so later, I took it on the highway. One minute I have 99 miles of range and the next I'm at zero.
Discussions on this forums confirmed to me that this is a battery issue and that I should seek a warranty fix. I was hopint that the community would collaborate on some advice of how to reach out to the dealers and what to expect. I was planning on contacting a couple of them and try to get a sense of who might be best to trust this issue with.
Hopefully you all han help guide me through a good warranty experience and that can be shared here for others.