Very randomly, 3 times in the last six months my car will crank and not fire. The conditions are always first thing in the morning. It has never cut out/stalled while driving. It will initially start as normal, then stop. It will then require a 'lot' of cranking, eventually putting up the message 'engine system fault'. But, keep cranking and it will fire and then operate as normal for weeks/months. No codes showing/pending, no leaks, regularly serviced (Oct 2018). Goes like a train in all other respects.

Any help would be gratefully received!

Thanks