RE: Intermittent Starting on Renault Kangoo ZE
I had something similar, but not in Summer! I couldn't identify if it was due to external or internal dampness/temperature, but the warnings - including the spanner, simply disappeared as the ambient temperature increased to around 12C. This only happened when the vehicle was not in its garage, which was infrequently as I charge it there.
Your solution of leaving to the next day could well be shortened to just a few hours!