rick, mine did it a couple of weeks ago after about 6 starts/stops (quick errand running) and on the last stop just click. ambient temps over 90 deg f. it took 2 cycles of the key to get it to turn over.
a couple of years ago it would do the same thing after a hwy run of over 100miles also in high ambient temps. sometime would take 12-14 key cycles to turn over, but it has not shown the same phenonema since. i should mention i do have a habit if on a longish trip to NOT turn the car off unless absolutely necessary!
i also cleaned up a corroded positive battery terminal and sofar (touch wood) it hasn't done it again.
lemme know if you find corrosion on the starter connection when i will check mine too
good luck
Bob