RE: Falling out of love...
Hello Bob, firstly nice to hear from you and I'm sure we'd all be interested if you might give us a quick run-down on your ownership motivations and experiences.
Obviously, this current experience is not one of your better moments!
For a purely guess-work engineering point of view, I can't see many circumstances where you'd get that sort of warning if it wasn't a signal from the battery indicating a fault. Maybe a damaged cell or a failed electrical connection. If the BMS detects just a teeny increase in voltage drop across an interconnection then I would expect it'd give that sort of message because if you are in the middle of a 200A drawing overtake, a cell interconnection could jump into thermal runaway very quickly. I suspect you'll be ending up with a replacement battery, but that's just an absolute pure guess.
Notwithstanding your current issue, I'm in exactly the same situation and mind-set as you. Not sure if we are on like deals, but the final payment for the car was always going to be unrealistic. I have asked RCI if they can tell me a little earlier what sort of buy-out value they're really going to ask for, because the final payment option price is ludicrous in my case. I am rather expecting that RCI will simply say 'you pay that, or hand it back' because they are a bit monolithic in their processes and to them it is an asset to recover.
If there is no option to buy it outright for a realistic price, then it is a no-brainer for me, my Fluence story ends. It's not even cheaper to run than my aged Vectra which I have kept and is still parked up. Adding on the concerns about reliability and there are a few intakes-of-breath to do in the future if I (that is, 'we') are going to punt money at a 3 year old car that is basically unknown to anyone for us to get competetive repair costs.
The good news to note, though, is that all the expensive bits I can imagine are 'unknown' are the drivetrain bits. A half of that is the battery, which is effectively indefinitely warranted because we don't own it. The other half, motor inverter etc., is warranted for 5 years or 100k mile, rather than just the 4. So there are still a few more years to get out of the cars yet, they are only a half way through their actual drivetrain warranty period.
I am sure I can say that we are now all keen to know what comes of the fault you've experienced, and also any more intro you'd like to offer would be welcomed.