I had my i3 do unintentionally acceleration yesterday. I had cruise control on at some point and came to a traffic hold up. I think I must have pressed wrong button as it tried to accelerate to the previously set speed. I have ACC so I maybe have to document exactly what the status was before the ‘resume’. It was unexpected but I concluded ‘operator error’.
Just thought this might be an explanation for some other cases if folks have accidentally invoked cruise or failed to cancel. If the brake hadn’t been pressed I think this is a possibility?