Yup, positioning. On occasion my Polar will tell me to "check transmitter" and if I don't get to it soon enough, it'll read 00. Fiddling with the positioning usually fixes the problem.
On two occasions outside I've had some sort of interference when it said my HR went from 55% to 100% over the course of, literally, two steps. But it's more frequent that I have to check the positioning.
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