Fortunately, these aren't too complex of a machine.
Here's what you have to do to start (no pun intended):
Verify that it is in fact a no spark condition if possible. From your description, when it dies next time, confirm that it is dead by turning the key to start it and verify that it won'd fire. Without turning it off (since you said that seems to reset it) check for spark at the plug while trying to turn it over.
Once you have verified a spark problem, report back and I'll tell you where I would go next.
I'll say from your description it sounds like either a ground problem or loose wire somewhere but you need to confirm the spark issue before you start heading that direction.
I would literally carry a spare plug with me to use for the testing so you don't have to pull your existing one out when it dies.
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