Could be an electronic problem, immobiliser for instance, or it could be the starter motor has become temperature sensitive.
I suggest you check the supply to the motor when it won't start and double check by providing the motor with an independent supply. Shorting the solenoid if it is accessible will take final diagnosis another step further and then independently energising the solenoid a step furth still.
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That's great, but how would starter problem be related to engine cutting off after 30 minutes
The cutting out and the none-starting might not be connected though probably is. Diagnosis has to begin somewhere and working backwards from the starting trouble is probably the best place to begin eliminating things and beginning to form a few ideas.
Of course if dedicated diagnostic equipment is available simply plugging it in could provide a short-cut.
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