If the car will crank normally, then the car battery is probably OK.
Does the G37 have a "fobgina"? If so, insert the fob and, if the car starts normally, then the fob battery is low. If it doesn't start reliably, then the fob (or immobilization system) may be bad.
If no fobgina, then I'd replace the battery because racecar - they're cheap. Get a major brand and check the date on the package. If that doesn't work, then I would suspect a bad fob (or immobilization system).
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