If I understand you correctly, Your car starts/runs fine when cold. Then fails to start (cranks/no start) later once the engine is warm. Is this correct?
I know some have had similar experiences with fuel pump relay failing.
As far as the crank position sensor mentioned above, see if your tach moves when you are cranking during the no start condition. Tach moves, CPS most likely good. Tach stays at 0, CPS bad.
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