It does seem very likely to have been a temporary fuel delivery issue. It really reminded me of hitting a kill switch the way it powered down so quickly, which immediately led me to wonder about overheating.
I would not have thought of the vent in the gas cap though! With the dry weather, there was alot of dust and debris blowing around. I'll check out the cap, and otherwise if it happens again I'll have to do some carb work.
Thanks for the helpful replies!
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