2001 Vauxhall Corsa Starting up.

Engine Mechanical problem
2001 Vauxhall Corsa Automatic 73000 miles

Evere since having this car from new, when starting the car it can often just stall. Usually will restart fine on the next turn. Vauxhalls have never been able to find a fault. But recently iv noticed it happening more often, and this week has actually not started at all three times. I had to call the aa out, and the said to just reset the alarm etc and leave for 10-15mins and try again, which does seem to work. My bf believes it could possibly be the starter motor. I have had a diagnostics test done and nothing shows on this?? What could be the fault, as dont want to keep paying vauxhalls prices and still the problem remains???

My car is a 1.2 GLS Vauxhall Cora (2001)

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