My 749S has just had the ECU replaced during its first service. It had been cutting out at junctions and refusing to tick over.
I rode it back from Woods yesterday and everything was perfect.
Just been out for a ride this morning, about 120 miles, and it has cut out twice when slowing down and then wouldn't tick over when I got home.
I'll try it again later in the week. Don't you just love 'em!