2005 kia Sedona starts will run fine then next time cranks won't start wait 15

I have a Sedona that is doing the same thing. I took it to my local Auto Zone and had it scanned, the codes referred to a camshaft position sensor bank 1. This vehicle has 2, one on each cam gear. Bank 1 the cam gear near the fire wall, bank 2 near the radiator. You could try checking the codes to see what they read. Hope this is helpful.