ECO mode also affects how much power the HVAC system consumes. And personally I prefer the feeling of the accelerator pedal in ECO mode. YMMV.

At first blush it sounds like it could be an ABS-related issue. Maybe one of the sensors is acting up and sending bad data to the controller which reduces torque to one of the wheels on a turn. Or it could be a mechanical issue with one of the CV joints but those usually make noise before affecting ...

A weak 12V battery can cause many odd issues. I'd replace the battery in your FOB(s) and also check the condition/age of the 12V battery.

It could be something else but start with the easy stuff first.

Nice job on getting this fixed, and thanks for the final update!

The 'internal resistance' of the battery - often assumed to be measured by the Hx reading in LeafSpy - makes a big difference in how much the battery heats up when charged or discharged. The 40kWh packs do seem to have much more stable Hx readings than the 30kWh packs. So if that is truly a measurem...

Maybe it just needed a hard reset...

Not any more....
https://www.youtube.com/watch?v=gwy-SINthQI

3/16 ID x 5/16 OD vinyl tubing works well. Clear tubing is nice so you can see the fluid inside. As for the jar, any old bottle works. Plastic is nice so it won't fall and break. Many auto parts stores will recycle the old brake fluid or if you have a household hazardous waste place handy they will ...

You can probably find a wiring diagram for your Leaf at nicoclub.com. I'd look through that and see what circuits are powered by the fuses and/or warm relay you mentioned in the OP and try to determine if they are malfunctioning somehow.

It will certainly make it one way but if the charging stations are down or unavailable for some reason, doing a round trip would be nerve racking, IMO.