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Since a few days, the smartband records my steps as I was running, even I'm only going quietly. I've reinitialized the Smartband several times, but it doesn't change anything. Any idea to solve this ? Thanks !
How accurate is your GPS?
Settings > Location > Mode > High accuracy
Mine has been doing something similar lately - It knows I'm or atleast it says I'm in a deep sleep at 3am but has sometimes claimed I've been running for 22minutes but not moved - I'm trying to track down the reason why and so far the only thing that seems to remotely work is to perform a switch off and restart periodically
Thanks, but GPS is switched on "high accuracy" 
@Thommo... I do the same, but I'm really upset that I've to do that regularly. And now, I just did it, but nothing changed !