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Most likely is intermittent in starter solenoid relay
Next most likely is key switch start connection intermittent. a tester will have to be used to find where the power is being lost from the start terminal of ignition switch to starter solenoid pilot connection to the main starter output power from solenoid to starter main contactor.
Crank or cam sensor probably as plugs bad plugs would start but miss the sensor will either give a start or no start condition and on 1 truck the crank sensor went out and it would run cold but miss like crazy when warm,I work in a chyrsler shop and have never seen that happen and even a scan tool didn't pick it up.
Try this first. With one of you under the car whack the starter with a hammer as the other of you turns the key t the start position and holds it there. No wimpy whacks here give it one or two good ones. If it is a bad starter it may start this way. If it does, a new starter motor is in your future. Very easy to change on a Jeep. If it doesn't work let me know and we will go further.