Thanks McRat. What is a slow-boot? Will try anything at this stage!
The stability problem was an information/alarm message on the dash( steering wheel). Said it was due to a low battery and I should drive with caution.
The computers in the I-Pace don't wake up very quickly. This is both bad and good. While it keeps parasitic losses very low, it also means that if you start driving without the computers running, they might not wake up that trip.
Lock you car (if unlocked).
Unlock your car (unplug if necessary).
Hop in, and push the ON/OFF button for a full second.
The car seems to wake up in this order:
First the telephone link wakes up.
Next the music system.
Then the Navigation.
Once the Navigation is up, then drive off.
This cycle can take <10 seconds to a full minute or more. Especially the NAV.
When I wait for everything to wake up, I have had no problems other than the rare Change To Celsius bug, where the temp knobs change their display to °C.
I just hop in and immediately take off, there is chance I will get the Black Screen issue, Temp Screen issue, and no NAV.
However, I have not seen a SC/TC problem. On most cars, that is related to a wheel sensor error.
Hopefully they will refine the software and address the boot time, or at least put a WAIT message on it like you see on some diesels in very cold weather.
This isn't the only car I've seen with quick boot issues.
I have also noticed that some USB devices will hamper booting, but it just means a longer delay.