Intermittent problems are the hardest to figure out. Carry a multimeter with you so next time it happens you can diagnose the problem. I'm leaning towards a battery cable or battery cable connections. That could also include a problem inside the starter solenoid housing. You can perform a voltage drop test on both your battery cables by placing the leads on both end of the positive cable.(Battery side and starter side) and your negative by battery side and say the cylinder block or frame. You should see say .1 or .2 volts max. When it happens, I would like to see you check the votage at the battery itself. If you have 12.8 volts or 13 or whatever and your volt gauge reads 8, you know you have a cable issue, intenral starter issue, and quite possibly a ignition switch issue depending on where your volt gauge is wired into the system.
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Todd
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