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personal experience
I hope you find a simple solution; but, just in case ...
The next time your vehicle won't start, look under the hood to see if the starter is actually turning the engine over and not just cranking away by itself (it's hard to discern by sound from inside the vehicle). A broken starter gear tooth can cause an erratic failure just like monster described. You'd be at the mercy of the random alignment of gears each time the engine is shut off, that they wouldn't align on the broken tooth, for each subsequent start up. Repeated starting attempts may eventually realign the gears; but, perhaps not always before the battery goes dead. If it's this starter problem, your other troubleshooting will be in vain.
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