Poor Service delivery cannot find fault on new car

I purchased a brand new 2015 Ford Fiesta St from Ford the Glen. The car is 7 months old and has about 9500km on the clock to date, however i have a starting issue with the vehicle. In the morning the swings and starts without any issue but after being driven for plus minus 50km or so and the car is warm I tend to have this dragging start. It does not always happen but its happened a few times since i bought this car. I've booked it 5 times at Ford the glen and at first i assumed it was the battery considering it might have stood on the dealers floor for a while, (Ford The Glen) response was that the battery had been tested and there was no problem with the battery. Second time round I explained to the service adviser that the car drags and starts once its warm, they had tested the car on the dyno and found that it does have a hard start once warm and they've advised me to only use 95 fuel and even now after using this fuel I've noticed that the car drags and starts very often now.<br> <br> I am very annoyed with Ford's service particularly Ford the Glen and I want the dealer to know that this is not the way customers should be treated.