For what it's worth, my Garmin 66W would keep forgetting region settings every time it powered on because it would not pick up a GPS signal. Obviously due to the heated windscreen in the I-Pace. I finally found some advice to connect it to an external power source and leave it outside for 45 minutes to pick up a good GPS signal.
Once that was done, it has been sitting right behind the rear view mirror with no issues since. Well other than never picking up a GPS signal, but that is not something I find useful as I only want it to record footage.