Your long-term experience reinforces what we already know from our time with all the latest Hyundai models.
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I'd say the battery could be tired and lacking the grunt to crank the engine and power it when the engine is hot. Once it's cooled for a period it doesn't require the same power to crank the engine, so there's grunt left to run the engine as well crank it.
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It's not a particular problem of the Lantra, and I would expect it could be fixed. I had a recent case where the engine in a car of another make was shaking at idle; that turned out to be the PCV valve. The valve was replaced and the car ran fine. So check the engine for things that could cause an air leak at idle.
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