Honest John advises learning to left-foot brake when driving automatics to retain full control.

I would imagine this advice also applies to hybrid/electric vehicles.

One thing to always be careful of when using electric-powered vehicles is that electric motors, for the same power input, usually produce significantly more torque than petrol or diesel engines (see Teslas for examples of how quick they are off the mark). It could be for hybrids and range extenders that the changeover from petrol/both to fully electric isn't smooth enough or that the controls software/hardware is acting up when reacting to throttle pedal position, rate of change and overall speed. That's just a guess mind you, given (I presume) they are all drive-by-wire systems.

When were the accidents - at low speed whilst parking/maneuvering or in a queue of traffic, when an auto gear box car control might be the cause (as galileo says, left foot braking as recommended by HJ himself would be the answer) , or general driving, when a controls system fault as I described above might be the cause.

What were the EXACT circumstances in which the accidents happened? Were they during low-speed manoeuvering (e.g. in a car park), or while driving on open roads?

Some i3 owners have reported an occasional issue with the regenerative braking, which happens when the driver lifts off the throttle. Sometimes, if the driver is off the throttle when taking a corner quickly, or if the car goes over a big bump / pothole while off the throttle, the i3's wheel sensors (used by the traction control & stability systems) will temporarily disable regenerative braking and the car will switch to 'coast' mode.

So the car will suddenly no longer be braking in regenerative mode, and will feel like it is speeding forwards. This 'unintended lack of deceleration' has nearly caught some drivers out.