Doesn't really sound like a seizure either. If it was you'd imagine it wouldn't want to turn over or would be seriously down on power across the board. You could peep in the exhaust port to confirm your thoughts if you wanted to.
I'd probably be pulling the plug out as soon as it dies and having a look at it. I'd then be grounding it out while hitting the starter and seeing if you have spark. Is it like someones hitting the kill switch on you??
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