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I had the same problem, I changed my card becuase I guess it was showing a false empty thing, bascially it was saying it was empty but it was actually full. And then I changed the batteries and that is what it was. It wasn't that it was cold, it was just out of battery life. They seem to last only a days worth or about 6-8 hours of it being on alone. I am starting to look at the HD's because they are obviously better and more worth the money.