this was working fine until I unpaired it and repaired it for another problem. Can't believe though that had anything to do with it but that was the only thing that was changed. It seems to read it every ten minutes or so as I believe it's suppose to but if I do it manually it never reads it and it says Try Again. I wear it the way I always have nothing changed there. I even cleaned the sensors on the back. No help. I have V Tac a racing heart condition so I check my HR quite often. Any help would be greatly appreciated.