crunner says:I was going to make the same complaint as MarkedMan, but about Apple instead. Why would Nike be to blame for a bug in the nano? I think this is an Apple issue.
to bignickstyle: i think you might have low battery in your sensor. I had similar 'calibration issues' and found out it was simply that my sensor was running out of juice. It wasn't sending a strong enough signal for my kit to hear.