MD Auto Stop Start

[EJ Parr]

I have a 2015 MD Titanium Diesel Hatch
My issue is that the restart function of the Auto stop start feature is problematic, sometimes it does and sometimes it doesn't.
Unticking the Auto Engine off in the In dash Display menu temporarily resolves the issue but this box does not stay unticked.
It will turn itself back on by itself.
Being able to turn off the the feature will give me peace of mind as I will then not have to worry about whether the car will restart as it should. It is disconcerting to find that the car is not restarting when you wish to take off from the traffic lights or stopped traffic
Advice on cause and how to fix would be appreciated.