This is not a normal problem, most Mazda Miata's don't have it. There is probably a short somewhere. It could be in the electrical harness of the car, which would be a bear to find. How often does this happen? Is it immediate (after you put a new battery in) or does it take a couple of years? If slow it could be an electronic board short. If fast it probably ha to do with the harness and then I would wish you luck in finding that.
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