I am having the same problem as of 3 weeks ago. I thought it was the battery. Took it and had it tested and it read 600CCA of 700 so had it replaced. 2 weeks later it did the same thing. Just happened again tonight. My promblem is it will crank, with no fire... unless left alone for some random amount of time. Awesome.

Malcolm

****Note****
Had it jumped after the first no fire, and must have been coinsidence that it started because jumping tonight helped none, and besides the battery is new, alternator tested fine.