To the OP, does the car stumble a little when it does start after cranking for a few seconds? To me it sounds like a fuel issue. Either an air leak is causing you to lose fuel pressure (worn or cracked seals in the fuel system such as injector o-rings) OR an injector(s) is leaking. If you have an injector leak, they will start to leak as soon as you shut the vehicle off. If you start the vehicle back up as soon as you shut it off, you shouldn't have any cranking issues, but leaving it for a couple hours will cause the injectors to slightly flood the chamber and thus the hard starts. Leaving it overnight will "dry up" the flood and so no hard starting issues.
Pressure test the fuel system and see if there is any fuel pressure loss.
Old thread I know.
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