Mokka won't start after a stall

My 68 plate Mokka 1.4 petrol has a random issue which I hope someone help with.....
Having always had a 1.6 or bigger engine I find that the Mokka is somewhat more prone to stalling if not given enough revs on hill starts or in hurried drive-offs.
However, the stalling isn't the problem; it's that sometimes after a stall, the engine cannot be restarted - as if the clutch isn't depressed. It doesn't happen often but typically always with an impatient queue behind. It's only happened about eight times in the 6 months I've had it, less so now as I'm now careful to over-rev but I still get caught out.
I can't say I've noticed if it happens after the auto-stop-start has attempted (and failed) or had an immediate re-stall.
I initially tried removing/reinserting the key, pressing pedals etc but it wouldn't start.
I read on a forum somewhere about some electrical circuits remaining active after the ignition's turned off and only going off when the driver's door is opened so in desperation I tried that and on the twice I tried it, I was able to restart manually straight away.
I'm beginning to think it could be something to do with the auto-stop-start; as if it's "getting confused".
I had it into the dealership and got the usual chocolate fireguard response and of course if the fault isn't apparent they can't fix it.
Has anyone any knowledge of this or similar effects that I can use to argue my case?
Davy

 

Hi mate did you ever resolve the problem because I just had the exact same issue today ?

 

Hi Wolf, in a nutshell - Possibly but I'm not 100% sure!
I returned it to the dealership who grudgingly admitted that there was a software update "to cure the tendency of these engines to stall" and they agreed to apply it - although never admitting to knowing of issues regards failing to restart. They did the work in January just before we went on holiday and the car was only rarely used after our return early-February until the lockdown - since when it's only done about 15 miles a week. However, in that time the fault hasn't reappeared, BUT I'm not doing anything like the mileage when I experienced the problems so I'm hoping, but not fully convinced the problem's gone.
Also, I finally managed to find someone locally who owns the same year/model and they said they too had experienced exactly the same fault and a reluctance of the dealership (not the same as mine) to admit the possibility of a re-start problem - which disappeared after a software update!
Incidentally, a friend who's a workshop manager for Mercedes once told me their dealerships do everything they can to avoid admitting to any "known" problems; so as far as I'm concerned, there was/is a problem with the software but because it probably costs dealerships to apply these updates they won't admit to a problem.
Good luck and let me know if you resolve it.