ENGINE STARTS AND THEN AFTER A WHILE CANT RESTART

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I WILL GET IN MY 1995 JEPP DRIVE 20 MINUTES INTO TOWN AND WILL STOP AT STORE AND COME BACK OUT LIKE SAY NO MORE THAN 10 MINUTES AND IT WONT START. I WILL WAIT LIKE 15 MINUTES AND IT WILL START BACK UP. BY THIS TIME IM SCARED IT WONT START AGAIN AND I GO HOME. I HAVE CHECKED STARTER,BATTERY AND ALTERNATOR. SOUNDS LIKE SOME TYPE OF HEATING PROBLEM TO ME. HAVE ANY SUGGESTIONS????? PLEASE HELP