Edie started doing this recently too, after we changed her food. It isn't the same shiver as she does when she's cold, it's a short sharp shiver every couple of seconds rather than a constant slight tremble. I think it's because she gets a sudden rush of energy, she reminds me of me when I've had too much coffee. Doesn't feel great, but then it wears off and everything is fine.
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I just fed him, left the food for half hour while human dinner was cooking so it was a bit warmer and he didn't shake at all so I'm hopeing that was it, also feeling a little silly I never thought of this lol! So fingers crossed thanks guys