Hi, Newbie here. Did you every get to the bottom of this as I seem to be having a very similar experience with my ZS where it will limit/reduce power without any warning. It usually happens when down to 2 bars but this morning when I did the school run it was at 3 bar and still limited power. It's a bit worrying, and have been caught out on this, as I don't find out I have limited power until I pull out onto the main road which is a 60 and slightly up hill. I then find out I have a max 60-65% power.
I try to leave the car plugged in over night once a month to balance but can't believe that it doesn't tell you when it drops. Even happens when I have been driving for a while, get to 2 bar and then drops power. This is usually a few miles before the low battery light comes on.
We have a Zoe and that doesn't limit the power at all when either cold or low (granted I'm usually driving slow anyway when it's flashing red ;-) )
I don't know if I should take this up with the dealership or what?
Cheers