Ask the Expert: Why doesn't my Hyundai start when it's warm?

My nine-year-old Hyundai i10 has always started first time, but recently it has occasionally failed to restart after a run of a few miles. The engine cranks but doesn’t fire.

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, Hyundai , Dear Alex , Hyundai I10 , Hyundai Dealer , Coolant Temperature Sensor , Iagnostic Check ,