HR monitor shows 000 during jogging

[pinophone]

Hi Everybody! I’m new PT happy user! I’m just experiencing problem with heart rate monitor when I starts it for monitor my jogging/exercises! It shows almost always 000 instead of my HR and it’s annoying me because I need to know it to best calibrate my sport activities and because I bought it mainly for it!! Is it happening just to me or it’s a known bug?
It seems that HR monitor is working well just when I don’t move! Don’t know if this info could be important but I thought to write it here!
Thank you